diff --git a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
index be7a3c228..37a5b3fe4 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.cpp
@@ -73,51 +73,58 @@ bool HeaderPolicy::readRequiresGermanUmlautProcessing() const {
             REQUIRES_GERMAN_UMLAUT_PROCESSING_KEY, false);
 }
 
-bool HeaderPolicy::writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
-        const bool updatesLastUpdatedTime, const bool updatesLastDecayedTime,
-        const int unigramCount, const int bigramCount, const int extendedRegionSize) const {
+bool HeaderPolicy::fillInAndWriteHeaderToBuffer(const bool updatesLastUpdatedTime,
+        const bool updatesLastDecayedTime, const int unigramCount, const int bigramCount,
+        const int extendedRegionSize, BufferWithExtendableBuffer *const outBuffer) const {
     int writingPos = 0;
-    if (!HeaderReadWriteUtils::writeDictionaryVersion(bufferToWrite, mDictFormatVersion,
+    HeaderReadWriteUtils::AttributeMap attributeMapToWrite(mAttributeMap);
+    fillInHeader(updatesLastDecayedTime, updatesLastDecayedTime,
+            unigramCount, bigramCount, extendedRegionSize, &attributeMapToWrite);
+    if (!HeaderReadWriteUtils::writeDictionaryVersion(outBuffer, mDictFormatVersion,
             &writingPos)) {
         return false;
     }
-    if (!HeaderReadWriteUtils::writeDictionaryFlags(bufferToWrite, mDictionaryFlags,
+    if (!HeaderReadWriteUtils::writeDictionaryFlags(outBuffer, mDictionaryFlags,
             &writingPos)) {
         return false;
     }
     // Temporarily writes a dummy header size.
     int headerSizeFieldPos = writingPos;
-    if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, 0 /* size */,
+    if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(outBuffer, 0 /* size */,
             &writingPos)) {
         return false;
     }
-    HeaderReadWriteUtils::AttributeMap attributeMapTowrite(mAttributeMap);
-    HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, UNIGRAM_COUNT_KEY, unigramCount);
-    HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, BIGRAM_COUNT_KEY, bigramCount);
-    HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, EXTENDED_REGION_SIZE_KEY,
-            extendedRegionSize);
-    if (updatesLastUpdatedTime) {
-        // Set current time as a last updated time.
-        HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_UPDATED_TIME_KEY,
-                TimeKeeper::peekCurrentTime());
-    }
-    if (updatesLastDecayedTime) {
-        // Set current time as a last updated time.
-        HeaderReadWriteUtils::setIntAttribute(&attributeMapTowrite, LAST_DECAYED_TIME_KEY,
-                TimeKeeper::peekCurrentTime());
-    }
-    if (!HeaderReadWriteUtils::writeHeaderAttributes(bufferToWrite, &attributeMapTowrite,
+    if (!HeaderReadWriteUtils::writeHeaderAttributes(outBuffer, &attributeMapToWrite,
             &writingPos)) {
         return false;
     }
-    // Writes an actual header size.
-    if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(bufferToWrite, writingPos,
+    // Writes the actual header size.
+    if (!HeaderReadWriteUtils::writeDictionaryHeaderSize(outBuffer, writingPos,
             &headerSizeFieldPos)) {
         return false;
     }
     return true;
 }
 
+void HeaderPolicy::fillInHeader(const bool updatesLastUpdatedTime,
+        const bool updatesLastDecayedTime, const int unigramCount, const int bigramCount,
+        const int extendedRegionSize, HeaderReadWriteUtils::AttributeMap *outAttributeMap) const {
+    HeaderReadWriteUtils::setIntAttribute(outAttributeMap, UNIGRAM_COUNT_KEY, unigramCount);
+    HeaderReadWriteUtils::setIntAttribute(outAttributeMap, BIGRAM_COUNT_KEY, bigramCount);
+    HeaderReadWriteUtils::setIntAttribute(outAttributeMap, EXTENDED_REGION_SIZE_KEY,
+            extendedRegionSize);
+    if (updatesLastUpdatedTime) {
+        // Set current time as the last updated time.
+        HeaderReadWriteUtils::setIntAttribute(outAttributeMap, LAST_UPDATED_TIME_KEY,
+                TimeKeeper::peekCurrentTime());
+    }
+    if (updatesLastDecayedTime) {
+        // Set current time as the last updated time.
+        HeaderReadWriteUtils::setIntAttribute(outAttributeMap, LAST_DECAYED_TIME_KEY,
+                TimeKeeper::peekCurrentTime());
+    }
+}
+
 /* static */ HeaderReadWriteUtils::AttributeMap
         HeaderPolicy::createAttributeMapAndReadAllAttributes(const uint8_t *const dictBuf) {
     HeaderReadWriteUtils::AttributeMap attributeMap;
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 1208d2c2a..d65315212 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
+++ b/native/jni/src/suggest/policyimpl/dictionary/header/header_policy.h
@@ -149,9 +149,13 @@ class HeaderPolicy : public DictionaryHeaderStructurePolicy {
     void readHeaderValueOrQuestionMark(const char *const key,
             int *outValue, int outValueSize) const;
 
-    bool writeHeaderToBuffer(BufferWithExtendableBuffer *const bufferToWrite,
-            const bool updatesLastUpdatedTime, const bool updatesLastDecayedTime,
-            const int unigramCount, const int bigramCount, const int extendedRegionSize) const;
+    bool fillInAndWriteHeaderToBuffer(const bool updatesLastUpdatedTime,
+            const bool updatesLastDecayedTime, const int unigramCount, const int bigramCount,
+            const int extendedRegionSize, BufferWithExtendableBuffer *const outBuffer) const;
+
+    void fillInHeader(const bool updatesLastUpdatedTime, const bool updatesLastDecayedTime,
+            const int unigramCount, const int bigramCount, const int extendedRegionSize,
+            HeaderReadWriteUtils::AttributeMap *outAttributeMap) const;
 
  private:
     DISALLOW_COPY_AND_ASSIGN(HeaderPolicy);
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 43227635c..b6f813c75 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
@@ -39,8 +39,9 @@ void Ver4PatriciaTrieWritingHelper::writeToDictFile(const char *const dictDirPat
             BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE);
     const int extendedRegionSize = headerPolicy->getExtendedRegionSize()
             + mBuffers->getTrieBuffer()->getUsedAdditionalBufferSize();
-    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, false /* updatesLastUpdatedTime */,
-            false /* updatesLastDecayedTime */, unigramCount, bigramCount, extendedRegionSize)) {
+    if (!headerPolicy->fillInAndWriteHeaderToBuffer(false /* updatesLastUpdatedTime */,
+            false /* updatesLastDecayedTime */, unigramCount, bigramCount, extendedRegionSize,
+            &headerBuffer)) {
         AKLOGE("Cannot write header structure to buffer. updatesLastUpdatedTime: %d, "
                 "updatesLastDecayedTime: %d, unigramCount: %d, bigramCount: %d, "
                 "extendedRegionSize: %d", false, false, unigramCount, bigramCount,
@@ -62,9 +63,9 @@ void Ver4PatriciaTrieWritingHelper::writeToDictFileWithGC(const int rootPtNodeAr
     }
     BufferWithExtendableBuffer headerBuffer(
             BufferWithExtendableBuffer::DEFAULT_MAX_ADDITIONAL_BUFFER_SIZE);
-    if (!headerPolicy->writeHeaderToBuffer(&headerBuffer, true /* updatesLastUpdatedTime */,
+    if (!headerPolicy->fillInAndWriteHeaderToBuffer(true /* updatesLastUpdatedTime */,
             true /* updatesLastDecayedTime */, unigramCount, bigramCount,
-            0 /* extendedRegionSize */)) {
+            0 /* extendedRegionSize */, &headerBuffer)) {
         return;
     }
     dictBuffers.get()->flushHeaderAndDictBuffers(dictDirPath, &headerBuffer);
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 442373b29..1e57a0b5d 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
@@ -48,9 +48,9 @@ const char *const DictFileWritingUtils::TEMP_FILE_SUFFIX_FOR_WRITING_DICT_FILE =
     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 */);
+    headerPolicy.fillInAndWriteHeaderToBuffer(true /* updatesLastUpdatedTime */,
+            true /* updatesLastDecayedTime */, 0 /* unigramCount */, 0 /* bigramCount */,
+            0 /* extendedRegionSize */, dictBuffers.get()->getWritableHeaderBuffer());
     if (!DynamicPtWritingUtils::writeEmptyDictionary(
             dictBuffers.get()->getWritableTrieBuffer(), 0 /* rootPos */)) {
         AKLOGE("Empty ver4 dictionary structure cannot be created on memory.");