diff --git a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
index bc6e0dd..75ec169 100644
--- a/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
+++ b/native/jni/src/suggest/policyimpl/dictionary/structure/v4/ver4_patricia_trie_node_writer.cpp
@@ -232,11 +232,9 @@
 
 bool Ver4PatriciaTrieNodeWriter::removeNgramEntry(const WordIdArrayView prevWordIds,
         const int wordId) {
-    // TODO: Support n-gram.
     LanguageModelDictContent *const languageModelDictContent =
             mBuffers->getMutableLanguageModelDictContent();
-    return languageModelDictContent->removeNgramProbabilityEntry(prevWordIds.limit(1 /* maxSize */),
-            wordId);
+    return languageModelDictContent->removeNgramProbabilityEntry(prevWordIds, wordId);
 }
 
 // TODO: Remove when we stop supporting v402 format.
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 a03e2a5..b808c90 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
@@ -375,15 +375,7 @@
     if (wordId == NOT_A_WORD_ID) {
         return false;
     }
-    std::array<int, MAX_PREV_WORD_COUNT_FOR_N_GRAM> prevWordsPtNodePos;
-    for (size_t i = 0; i < prevWordsPtNodePos.size(); ++i) {
-        prevWordsPtNodePos[i] = mBuffers->getTerminalPositionLookupTable()
-                ->getTerminalPtNodePosition(prevWordIds[i]);
-    }
-    const int wordPtNodePos = mBuffers->getTerminalPositionLookupTable()
-            ->getTerminalPtNodePosition(wordId);
-    if (mUpdatingHelper.removeNgramEntry(WordIdArrayView::fromArray(prevWordsPtNodePos),
-            wordPtNodePos)) {
+    if (mNodeWriter.removeNgramEntry(prevWordIds, wordId)) {
         mBigramCount--;
         return true;
     } else {