diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index d7aa87dca..00ca5aff0 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -194,9 +194,8 @@ public class Suggest {
             }
             // At second character typed, search the unigrams (scores being affected by bigrams)
             for (final String key : mDictionaries.keySet()) {
-                // Skip UserUnigramDictionary and WhitelistDictionary to lookup
-                if (key.equals(Dictionary.TYPE_USER_HISTORY)
-                        || key.equals(Dictionary.TYPE_WHITELIST))
+                // Skip WhitelistDictionary to lookup
+                if (key.equals(Dictionary.TYPE_WHITELIST))
                     continue;
                 final Dictionary dictionary = mDictionaries.get(key);
                 suggestionsSet.addAll(dictionary.getWords(
diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
index 73fa83f9a..d742e2190 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
@@ -27,9 +27,12 @@ import android.os.AsyncTask;
 import android.provider.BaseColumns;
 import android.util.Log;
 
+import com.android.inputmethod.keyboard.ProximityInfo;
+import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.UserHistoryForgettingCurveUtils.ForgettingCurveParams;
 
 import java.lang.ref.SoftReference;
+import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.locks.ReentrantLock;
@@ -157,6 +160,14 @@ public class UserHistoryDictionary extends ExpandableDictionary {
         // super.close();
     }
 
+    @Override
+    public ArrayList<SuggestedWordInfo> getWords(final WordComposer composer,
+            final CharSequence prevWord, final ProximityInfo proximityInfo) {
+        // User history unigrams are not used at this moment. Implement this method to make them
+        // useful.
+        return null;
+    }
+
     /**
      * Return whether the passed charsequence is in the dictionary.
      */