diff --git a/java/proguard.flags b/java/proguard.flags
index 24b4c1987..ac5b7df16 100644
--- a/java/proguard.flags
+++ b/java/proguard.flags
@@ -44,6 +44,10 @@
   <init>(...);
 }
 
+-keepclasseswithmembernames class * {
+    native <methods>;
+}
+
 -keep class com.android.inputmethod.research.ResearchLogger {
   void flush();
   void publishCurrentLogUnit(...);
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 9b85fb65a..f0f5cd320 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -79,6 +79,7 @@ public class BinaryDictionary extends Dictionary {
         mUseFullEditDistance = useFullEditDistance;
         loadDictionary(filename, offset, length);
         mDicTraverseSession = new DicTraverseSession(locale);
+        mDicTraverseSession.initSession(mNativeDict);
     }
 
     static {
diff --git a/java/src/com/android/inputmethod/latin/DicTraverseSession.java b/java/src/com/android/inputmethod/latin/DicTraverseSession.java
index 4c3654213..c76815363 100644
--- a/java/src/com/android/inputmethod/latin/DicTraverseSession.java
+++ b/java/src/com/android/inputmethod/latin/DicTraverseSession.java
@@ -23,8 +23,8 @@ public class DicTraverseSession {
         JniUtils.loadNativeLibrary();
     }
     private native long setDicTraverseSessionNative(String locale);
-    //private native void initDicTraverseSessionNative(long nativeDicTraverseSession,
-    //long dictionary, int[] previousWord, int previousWordLength);
+    private native void initDicTraverseSessionNative(long nativeDicTraverseSession,
+            long dictionary, int[] previousWord, int previousWordLength);
     private native void releaseDicTraverseSessionNative(long nativeDicTraverseSession);
 
     private long mNativeDicTraverseSession;
@@ -43,8 +43,8 @@ public class DicTraverseSession {
     }
 
     public void initSession(long dictionary, int[] previousWord, int previousWordLength) {
-        //initDicTraverseSessionNative(
-        //mNativeDicTraverseSession, dictionary, previousWord, previousWordLength);
+        initDicTraverseSessionNative(
+                mNativeDicTraverseSession, dictionary, previousWord, previousWordLength);
     }
 
     private final long createNativeDicTraverseSession(String locale) {
diff --git a/native/jni/com_android_inputmethod_latin_DicTraverseSession.cpp b/native/jni/com_android_inputmethod_latin_DicTraverseSession.cpp
index 6ff953874..806ff1f1d 100644
--- a/native/jni/com_android_inputmethod_latin_DicTraverseSession.cpp
+++ b/native/jni/com_android_inputmethod_latin_DicTraverseSession.cpp
@@ -28,18 +28,20 @@ static jlong latinime_setDicTraverseSession(JNIEnv *env, jobject object, jstring
     return reinterpret_cast<jlong>(traverseSession);
 }
 
-#if 0
 static void latinime_initDicTraverseSession(JNIEnv *env, jobject object, jlong traverseSession,
         jlong dictionary, jintArray previousWord, jint previousWordLength) {
     void *ts = reinterpret_cast<void*>(traverseSession);
     Dictionary *dict = reinterpret_cast<Dictionary*>(dictionary);
+    if (!previousWord) {
+        DicTraverseWrapper::initDicTraverseSession(ts, dict, 0, 0);
+        return;
+    }
     int prevWord[previousWordLength];
     env->GetIntArrayRegion(previousWord, 0, previousWordLength, prevWord);
     DicTraverseWrapper::initDicTraverseSession(ts, dict, prevWord, previousWordLength);
 }
-#endif
 
-static void latinime_DicTraverseSession_release(
+static void latinime_releaseDicTraverseSession(
         JNIEnv *env, jobject object, jlong traverseSession) {
     void *ts = reinterpret_cast<void*>(traverseSession);
     DicTraverseWrapper::releaseDicTraverseSession(ts);
@@ -47,8 +49,8 @@ static void latinime_DicTraverseSession_release(
 
 static JNINativeMethod sMethods[] = {
     {"setDicTraverseSessionNative", "(Ljava/lang/String;)J", (void*)latinime_setDicTraverseSession},
-    //{"initDicTraverseSessionNative", "(JJ[II)V", (void*)latinime_initDicTraverseSession},
-    {"releaseDicTraverseSessionNative", "(J)V", (void*)latinime_DicTraverseSession_release}
+    {"initDicTraverseSessionNative", "(JJ[II)V", (void*)latinime_initDicTraverseSession},
+    {"releaseDicTraverseSessionNative", "(J)V", (void*)latinime_releaseDicTraverseSession}
 };
 
 int register_DicTraverseSession(JNIEnv *env) {