diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h
index f6ee0fe..cc7b5ff 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/pt_common/dynamic_pt_reading_helper.h
@@ -26,7 +26,6 @@
 
 namespace latinime {
 
-class BufferWithExtendableBuffer;
 class DictionaryBigramsStructurePolicy;
 class DictionaryShortcutsStructurePolicy;
 class PtNodeArrayReader;
@@ -75,12 +74,10 @@
         std::vector<int> *const mTerminalPositions;
     };
 
-    DynamicPtReadingHelper(const BufferWithExtendableBuffer *const buffer,
-            const PtNodeReader *const ptNodeReader,
+    DynamicPtReadingHelper(const PtNodeReader *const ptNodeReader,
             const PtNodeArrayReader *const ptNodeArrayReader)
-            : mIsError(false), mReadingState(), mBuffer(buffer),
-              mPtNodeReader(ptNodeReader), mPtNodeArrayReader(ptNodeArrayReader),
-              mReadingStateStack() {}
+            : mIsError(false), mReadingState(), mPtNodeReader(ptNodeReader),
+              mPtNodeArrayReader(ptNodeArrayReader), mReadingStateStack() {}
 
     ~DynamicPtReadingHelper() {}
 
@@ -255,7 +252,6 @@
     // TODO: Introduce error code to track what caused the error.
     bool mIsError;
     PtNodeReadingState mReadingState;
-    const BufferWithExtendableBuffer *const mBuffer;
     const PtNodeReader *const mPtNodeReader;
     const PtNodeArrayReader *const mPtNodeArrayReader;
     std::vector<PtNodeReadingState> mReadingStateStack;
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h
index bf06576..66845bb 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.h
@@ -44,8 +44,8 @@
             const PtNodeArrayReader *const ptNodeArrayReader,
             Ver4BigramListPolicy *const bigramPolicy, Ver4ShortcutListPolicy *const shortcutPolicy)
             : mTrieBuffer(trieBuffer), mBuffers(buffers),
-              mReadingHelper(mTrieBuffer, ptNodeReader, ptNodeArrayReader),
-              mBigramPolicy(bigramPolicy), mShortcutPolicy(shortcutPolicy) {}
+              mReadingHelper(ptNodeReader, ptNodeArrayReader), mBigramPolicy(bigramPolicy),
+              mShortcutPolicy(shortcutPolicy) {}
 
     virtual ~Ver4PatriciaTrieNodeWriter() {}
 
diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
index 980193d..efc29a0 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_policy.cpp
@@ -43,7 +43,7 @@
     if (!dicNode->hasChildren()) {
         return;
     }
-    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader, &mPtNodeArrayReader);
+    DynamicPtReadingHelper readingHelper(&mNodeReader, &mPtNodeArrayReader);
     readingHelper.initWithPtNodeArrayPos(dicNode->getChildrenPtNodeArrayPos());
     while (!readingHelper.isEnd()) {
         const PtNodeParams ptNodeParams = readingHelper.getPtNodeParams();
@@ -70,7 +70,7 @@
 int Ver4PatriciaTriePolicy::getCodePointsAndProbabilityAndReturnCodePointCount(
         const int ptNodePos, const int maxCodePointCount, int *const outCodePoints,
         int *const outUnigramProbability) const {
-    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader, &mPtNodeArrayReader);
+    DynamicPtReadingHelper readingHelper(&mNodeReader, &mPtNodeArrayReader);
     readingHelper.initWithPtNodePos(ptNodePos);
     return readingHelper.getCodePointsAndProbabilityAndReturnCodePointCount(
             maxCodePointCount, outCodePoints, outUnigramProbability);
@@ -78,7 +78,7 @@
 
 int Ver4PatriciaTriePolicy::getTerminalPtNodePositionOfWord(const int *const inWord,
         const int length, const bool forceLowerCaseSearch) const {
-    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader, &mPtNodeArrayReader);
+    DynamicPtReadingHelper readingHelper(&mNodeReader, &mPtNodeArrayReader);
     readingHelper.initWithPtNodeArrayPos(getRootPosition());
     return readingHelper.getTerminalPtNodePositionOfWord(inWord, length, forceLowerCaseSearch);
 }
@@ -158,7 +158,7 @@
                 shortcutLength);
         return false;
     }
-    DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader, &mPtNodeArrayReader);
+    DynamicPtReadingHelper readingHelper(&mNodeReader, &mPtNodeArrayReader);
     readingHelper.initWithPtNodeArrayPos(getRootPosition());
     bool addedNewUnigram = false;
     if (mUpdatingHelper.addUnigramWord(&readingHelper, word, length, probability, isNotAWord,
@@ -397,7 +397,7 @@
         mTerminalPtNodePositionsForIteratingWords.clear();
         DynamicPtReadingHelper::TraversePolicyToGetAllTerminalPtNodePositions traversePolicy(
                 &mTerminalPtNodePositionsForIteratingWords);
-        DynamicPtReadingHelper readingHelper(mDictBuffer, &mNodeReader, &mPtNodeArrayReader);
+        DynamicPtReadingHelper readingHelper(&mNodeReader, &mPtNodeArrayReader);
         readingHelper.initWithPtNodeArrayPos(getRootPosition());
         readingHelper.traverseAllPtNodesInPostorderDepthFirstManner(&traversePolicy);
     }
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 f26c430..acf0991 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
@@ -83,8 +83,7 @@
     Ver4PatriciaTrieNodeWriter ptNodeWriter(mBuffers->getWritableTrieBuffer(),
             mBuffers, &ptNodeReader, &ptNodeArrayReader, &bigramPolicy, &shortcutPolicy);
 
-    DynamicPtReadingHelper readingHelper(mBuffers->getTrieBuffer(), &ptNodeReader,
-            &ptNodeArrayReader);
+    DynamicPtReadingHelper readingHelper(&ptNodeReader, &ptNodeArrayReader);
     readingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
     DynamicPtGcEventListeners
             ::TraversePolicyToUpdateUnigramProbabilityAndMarkUselessPtNodesAsDeleted
@@ -168,8 +167,7 @@
             mBuffers->getShortcutDictContent())) {
         return false;
     }
-    DynamicPtReadingHelper newDictReadingHelper(buffersToWrite->getTrieBuffer(),
-            &newPtNodeReader, &newPtNodeArrayreader);
+    DynamicPtReadingHelper newDictReadingHelper(&newPtNodeReader, &newPtNodeArrayreader);
     newDictReadingHelper.initWithPtNodeArrayPos(rootPtNodeArrayPos);
     DynamicPtGcEventListeners::TraversePolicyToUpdateAllPositionFields
             traversePolicyToUpdateAllPositionFields(&newPtNodeWriter, &dictPositionRelocationMap);