diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
index 9726fb8..4c4e43b 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
@@ -68,6 +68,13 @@
               mHasHistoricalInfoOfWords(HeaderReadWriteUtils::readBoolAttributeValue(
                       &mAttributeMap, HAS_HISTORICAL_INFO_KEY, false /* defaultValue */)) {}
 
+    // Temporary dummy header.
+    HeaderPolicy()
+            : mDictFormatVersion(FormatUtils::UNKNOWN_VERSION), mDictionaryFlags(0), mSize(0),
+              mAttributeMap(), mMultiWordCostMultiplier(0.0f), mIsDecayingDict(false),
+              mLastUpdatedTime(0), mLastDecayedTime(0), mUnigramCount(0), mBigramCount(0),
+              mExtendedRegionSize(0), mHasHistoricalInfoOfWords(false) {}
+
     ~HeaderPolicy() {}
 
     virtual int getFormatVersionNumber() const {
@@ -139,7 +146,7 @@
             const int unigramCount, const int bigramCount, const int extendedRegionSize) const;
 
  private:
-    DISALLOW_IMPLICIT_CONSTRUCTORS(HeaderPolicy);
+    DISALLOW_COPY_AND_ASSIGN(HeaderPolicy);
 
     static const char *const MULTIPLE_WORDS_DEMOTION_RATE_KEY;
     static const char *const IS_DECAYING_DICT_KEY;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
index 07b8f18..c4166b2 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_dict_buffers.h
@@ -18,7 +18,7 @@
 #define LATINIME_VER4_DICT_BUFFER_H
 
 #include "defines.h"
-#include "suggest/policyimpl/dictionary/header/header_read_write_utils.h"
+#include "suggest/policyimpl/dictionary/header/header_policy.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/bigram_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/probability_dict_content.h"
 #include "suggest/policyimpl/dictionary/structure/v4/content/shortcut_dict_content.h"
@@ -39,8 +39,9 @@
         return Ver4DictBuffersPtr(new Ver4DictBuffers(dictDirPath, dictBuffer, isUpdatable));
     }
 
-    static AK_FORCE_INLINE Ver4DictBuffersPtr createVer4DictBuffers() {
-        return Ver4DictBuffersPtr(new Ver4DictBuffers());
+    static AK_FORCE_INLINE Ver4DictBuffersPtr createVer4DictBuffers(
+            const HeaderPolicy *const headerPolicy) {
+        return Ver4DictBuffersPtr(new Ver4DictBuffers(headerPolicy));
     }
 
     AK_FORCE_INLINE bool isValid() const {
@@ -118,30 +119,31 @@
     AK_FORCE_INLINE Ver4DictBuffers(const char *const dictDirPath,
             const MmappedBuffer::MmappedBufferPtr &dictBuffer, const bool isUpdatable)
             : mDictBuffer(dictBuffer),
-              mHeaderSize(HeaderReadWriteUtils::getHeaderSize(mDictBuffer.get()->getBuffer())),
-              mExpandableHeaderBuffer(dictBuffer.get()->getBuffer(), mHeaderSize,
+              mHeaderPolicy(mDictBuffer.get()->getBuffer(), FormatUtils::VERSION_4),
+              mExpandableHeaderBuffer(dictBuffer.get()->getBuffer(), mHeaderPolicy.getSize(),
                       BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
-              mExpandableTrieBuffer(dictBuffer.get()->getBuffer() + mHeaderSize,
-                      dictBuffer.get()->getBufferSize() - mHeaderSize,
+              mExpandableTrieBuffer(dictBuffer.get()->getBuffer() + mHeaderPolicy.getSize(),
+                      dictBuffer.get()->getBufferSize() - mHeaderPolicy.getSize(),
                       BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE),
               // TODO: Quit using header size.
-              mTerminalPositionLookupTable(dictDirPath, isUpdatable, mHeaderSize),
-              mProbabilityDictContent(dictDirPath, false /* hasHistoricalInfo */, isUpdatable),
-              mBigramDictContent(dictDirPath, false /* hasHistoricalInfo */, isUpdatable),
+              mTerminalPositionLookupTable(dictDirPath, isUpdatable, mHeaderPolicy.getSize()),
+              mProbabilityDictContent(dictDirPath, mHeaderPolicy.hasHistricalInfoOfWords(),
+                      isUpdatable),
+              mBigramDictContent(dictDirPath, mHeaderPolicy.hasHistricalInfoOfWords(), isUpdatable),
               mShortcutDictContent(dictDirPath, isUpdatable),
               mIsUpdatable(isUpdatable) {}
 
-    AK_FORCE_INLINE Ver4DictBuffers()
-            : mDictBuffer(0), mHeaderSize(0),
+    AK_FORCE_INLINE Ver4DictBuffers(const HeaderPolicy *const headerPolicy)
+            : mDictBuffer(0), mHeaderPolicy(),
               mExpandableHeaderBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
               mExpandableTrieBuffer(Ver4DictConstants::MAX_DICTIONARY_SIZE),
               mTerminalPositionLookupTable(),
-              mProbabilityDictContent(false /* hasHistoricalInfo */),
-              mBigramDictContent(false /* hasHistoricalInfo */), mShortcutDictContent(),
+              mProbabilityDictContent(headerPolicy->hasHistricalInfoOfWords()),
+              mBigramDictContent(headerPolicy->hasHistricalInfoOfWords()), mShortcutDictContent(),
               mIsUpdatable(true) {}
 
     const MmappedBuffer::MmappedBufferPtr mDictBuffer;
-    const int mHeaderSize;
+    const HeaderPolicy mHeaderPolicy;
     BufferWithExtendableBuffer mExpandableHeaderBuffer;
     BufferWithExtendableBuffer mExpandableTrieBuffer;
     TerminalPositionLookupTable mTerminalPositionLookupTable;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
index e8368af..a14a73c 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_writing_helper.cpp
@@ -55,7 +55,8 @@
 void Ver4PatriciaTrieWritingHelper::writeToDictFileWithGC(const int rootPtNodeArrayPos,
         const char *const trieFilePath, const HeaderPolicy *const headerPolicy,
         const bool needsToDecay) {
-    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers(Ver4DictBuffers::createVer4DictBuffers());
+    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers(
+            Ver4DictBuffers::createVer4DictBuffers(headerPolicy));
     int unigramCount = 0;
     int bigramCount = 0;
     if (needsToDecay) {
diff --git a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
index ff762d7..d959b26 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/utils/dict_file_writing_utils.cpp
@@ -43,8 +43,9 @@
 
 /* static */ bool DictFileWritingUtils::createEmptyV4DictFile(const char *const dirPath,
         const HeaderReadWriteUtils::AttributeMap *const attributeMap) {
-    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers = Ver4DictBuffers::createVer4DictBuffers();
     HeaderPolicy headerPolicy(FormatUtils::VERSION_4, attributeMap);
+    Ver4DictBuffers::Ver4DictBuffersPtr dictBuffers =
+            Ver4DictBuffers::createVer4DictBuffers(&headerPolicy);
     headerPolicy.writeHeaderToBuffer(dictBuffers.get()->getWritableHeaderBuffer(),
             true /* updatesLastUpdatedTime */, true /* updatesLastDecayedTime */,
             0 /* unigramCount */, 0 /* bigramCount */, 0 /* extendedRegionSize */);