diff --git a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp b/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp
index cc5252c..434858d 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/dictionary_structure_with_buffer_policy_factory.cpp
@@ -22,7 +22,7 @@
 #include "suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h"
 #include "suggest/policyimpl/dictionary/patricia_trie_policy.h"
 #include "suggest/policyimpl/dictionary/utils/format_utils.h"
-#include "suggest/policyimpl/dictionary/utils/mmaped_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
 
 namespace latinime {
 
@@ -31,7 +31,7 @@
                 const int bufOffset, const int size, const bool isUpdatable) {
     // Allocated buffer in MmapedBuffer::openBuffer() will be freed in the destructor of
     // impl classes of DictionaryStructureWithBufferPolicy.
-    const MmapedBuffer *const mmapedBuffer = MmapedBuffer::openBuffer(path, pathLength, bufOffset,
+    const MmappedBuffer *const mmapedBuffer = MmappedBuffer::openBuffer(path, pathLength, bufOffset,
             size, isUpdatable);
     if (!mmapedBuffer) {
         return 0;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
index 708967d..8ba057b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/dynamic_patricia_trie_policy.h
@@ -24,7 +24,7 @@
 #include "suggest/policyimpl/dictionary/bigram/bigram_list_policy.h"
 #include "suggest/policyimpl/dictionary/header/header_policy.h"
 #include "suggest/policyimpl/dictionary/shortcut/shortcut_list_policy.h"
-#include "suggest/policyimpl/dictionary/utils/mmaped_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
 
 namespace latinime {
 
@@ -33,7 +33,7 @@
 
 class DynamicPatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
  public:
-    DynamicPatriciaTriePolicy(const MmapedBuffer *const buffer)
+    DynamicPatriciaTriePolicy(const MmappedBuffer *const buffer)
             : mBuffer(buffer), mHeaderPolicy(mBuffer->getBuffer()),
               mDictRoot(mBuffer->getBuffer() + mHeaderPolicy.getSize()),
               mBigramListPolicy(mDictRoot), mShortcutListPolicy(mDictRoot) {}
@@ -86,7 +86,7 @@
     DISALLOW_IMPLICIT_CONSTRUCTORS(DynamicPatriciaTriePolicy);
     static const int MAX_CHILD_COUNT_TO_AVOID_INFINITE_LOOP;
 
-    const MmapedBuffer *const mBuffer;
+    const MmappedBuffer *const mBuffer;
     const HeaderPolicy mHeaderPolicy;
     // TODO: Consolidate mDictRoot.
     const uint8_t *const mDictRoot;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h b/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
index 0d85050..d0567fd 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/patricia_trie_policy.h
@@ -24,7 +24,7 @@
 #include "suggest/policyimpl/dictionary/bigram/bigram_list_policy.h"
 #include "suggest/policyimpl/dictionary/header/header_policy.h"
 #include "suggest/policyimpl/dictionary/shortcut/shortcut_list_policy.h"
-#include "suggest/policyimpl/dictionary/utils/mmaped_buffer.h"
+#include "suggest/policyimpl/dictionary/utils/mmapped_buffer.h"
 
 namespace latinime {
 
@@ -33,7 +33,7 @@
 
 class PatriciaTriePolicy : public DictionaryStructureWithBufferPolicy {
  public:
-    PatriciaTriePolicy(const MmapedBuffer *const buffer)
+    PatriciaTriePolicy(const MmappedBuffer *const buffer)
             : mBuffer(buffer), mHeaderPolicy(mBuffer->getBuffer()),
               mDictRoot(mBuffer->getBuffer() + mHeaderPolicy.getSize()),
               mBigramListPolicy(mDictRoot), mShortcutListPolicy(mDictRoot) {}
@@ -97,7 +97,7 @@
  private:
     DISALLOW_IMPLICIT_CONSTRUCTORS(PatriciaTriePolicy);
 
-    const MmapedBuffer *const mBuffer;
+    const MmappedBuffer *const mBuffer;
     const HeaderPolicy mHeaderPolicy;
     const uint8_t *const mDictRoot;
     const BigramListPolicy mBigramListPolicy;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/mmaped_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/mmaped_buffer.h
deleted file mode 100644
index 08add03..0000000
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/mmaped_buffer.h
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
- * Copyright (C) 2013, The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef LATINIME_MMAPED_BUFFER_H
-#define LATINIME_MMAPED_BUFFER_H
-
-#include <cerrno>
-#include <fcntl.h>
-#include <stdint.h>
-#include <sys/mman.h>
-#include <unistd.h>
-
-#include "defines.h"
-
-namespace latinime {
-
-class MmapedBuffer {
- public:
-    static MmapedBuffer* openBuffer(const char *const path, const int pathLength,
-            const int bufOffset, const int size, const bool isUpdatable) {
-        const int openMode = isUpdatable ? O_RDWR : O_RDONLY;
-        const int fd = open(path, openMode);
-        if (fd < 0) {
-            AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno);
-            return 0;
-        }
-        const int pagesize = getpagesize();
-        const int offset = bufOffset % pagesize;
-        int adjOffset = bufOffset - offset;
-        int adjSize = size + offset;
-        const int protMode = isUpdatable ? PROT_READ | PROT_WRITE : PROT_READ;
-        void *const mmapedBuffer = mmap(0, adjSize, protMode, MAP_PRIVATE, fd, adjOffset);
-        if (mmapedBuffer == MAP_FAILED) {
-            AKLOGE("DICT: Can't mmap dictionary. errno=%d", errno);
-            close(fd);
-            return 0;
-        }
-        uint8_t *const buffer = static_cast<uint8_t *>(mmapedBuffer) + offset;
-        if (!buffer) {
-            AKLOGE("DICT: buffer is null");
-            close(fd);
-            return 0;
-        }
-        return new MmapedBuffer(buffer, adjSize, fd, offset, isUpdatable);
-    }
-
-    ~MmapedBuffer() {
-        int ret = munmap(static_cast<void *>(mBuffer - mBufferOffset),
-                mBufferSize + mBufferOffset);
-        if (ret != 0) {
-            AKLOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
-        }
-        ret = close(mMmapFd);
-        if (ret != 0) {
-            AKLOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
-        }
-    }
-
-    AK_FORCE_INLINE uint8_t *getBuffer() const {
-        return mBuffer;
-    }
-
-    AK_FORCE_INLINE int getBufferSize() const {
-        return mBufferSize;
-    }
-
-    AK_FORCE_INLINE bool isUpdatable() const {
-        return mIsUpdatable;
-    }
-
- private:
-    AK_FORCE_INLINE MmapedBuffer(uint8_t *const buffer, const int bufferSize, const int mmapFd,
-            const int bufferOffset, const bool isUpdatable)
-            : mBuffer(buffer), mBufferSize(bufferSize), mMmapFd(mmapFd),
-              mBufferOffset(bufferOffset), mIsUpdatable(isUpdatable) {}
-
-    DISALLOW_IMPLICIT_CONSTRUCTORS(MmapedBuffer);
-
-    uint8_t *const mBuffer;
-    const int mBufferSize;
-    const int mMmapFd;
-    const int mBufferOffset;
-    const bool mIsUpdatable;
-};
-}
-#endif /* LATINIME_MMAPED_BUFFER_H */
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
new file mode 100644
index 0000000..6febd78
--- /dev/null
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/mmapped_buffer.h
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2013, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_MMAPPED_BUFFER_H
+#define LATINIME_MMAPPED_BUFFER_H
+
+#include <cerrno>
+#include <fcntl.h>
+#include <stdint.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+#include "defines.h"
+
+namespace latinime {
+
+class MmappedBuffer {
+ public:
+    static MmappedBuffer* openBuffer(const char *const path, const int pathLength,
+            const int bufferOffset, const int bufferSize, const bool isUpdatable) {
+        const int openMode = isUpdatable ? O_RDWR : O_RDONLY;
+        const int mmapFd = open(path, openMode);
+        if (mmapFd < 0) {
+            AKLOGE("DICT: Can't open the source. path=%s errno=%d", path, errno);
+            return 0;
+        }
+        const int pagesize = getpagesize();
+        const int offset = bufferOffset % pagesize;
+        int alignedOffset = bufferOffset - offset;
+        int alignedSize = bufferSize + offset;
+        const int protMode = isUpdatable ? PROT_READ | PROT_WRITE : PROT_READ;
+        void *const mmappedBuffer = mmap(0, alignedSize, protMode, MAP_PRIVATE, mmapFd,
+                alignedOffset);
+        if (mmappedBuffer == MAP_FAILED) {
+            AKLOGE("DICT: Can't mmap dictionary. errno=%d", errno);
+            close(mmapFd);
+            return 0;
+        }
+        uint8_t *const buffer = static_cast<uint8_t *>(mmappedBuffer) + offset;
+        if (!buffer) {
+            AKLOGE("DICT: buffer is null");
+            close(mmapFd);
+            return 0;
+        }
+        return new MmappedBuffer(buffer, bufferSize, mmappedBuffer, alignedSize, mmapFd,
+                isUpdatable);
+    }
+
+    ~MmappedBuffer() {
+        int ret = munmap(mMmappedBuffer, mAlignedSize);
+        if (ret != 0) {
+            AKLOGE("DICT: Failure in munmap. ret=%d errno=%d", ret, errno);
+        }
+        ret = close(mMmapFd);
+        if (ret != 0) {
+            AKLOGE("DICT: Failure in close. ret=%d errno=%d", ret, errno);
+        }
+    }
+
+    AK_FORCE_INLINE uint8_t *getBuffer() const {
+        return mBuffer;
+    }
+
+    AK_FORCE_INLINE int getBufferSize() const {
+        return mBufferSize;
+    }
+
+    AK_FORCE_INLINE bool isUpdatable() const {
+        return mIsUpdatable;
+    }
+
+ private:
+    AK_FORCE_INLINE MmappedBuffer(uint8_t *const buffer, const int bufferSize,
+            void *const mmappedBuffer, const int alignedSize, const int mmapFd,
+            const bool isUpdatable)
+            : mBuffer(buffer), mBufferSize(bufferSize), mMmappedBuffer(mmappedBuffer),
+              mAlignedSize(alignedSize), mMmapFd(mmapFd), mIsUpdatable(isUpdatable) {}
+
+    DISALLOW_IMPLICIT_CONSTRUCTORS(MmappedBuffer);
+
+    uint8_t *const mBuffer;
+    const int mBufferSize;
+    void *const mMmappedBuffer;
+    const int mAlignedSize;
+    const int mMmapFd;
+    const bool mIsUpdatable;
+};
+}
+#endif /* LATINIME_MMAPPED_BUFFER_H */