diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
index 635afe7cc..7b81e8be1 100644
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
@@ -70,6 +70,7 @@ public final class UserHistoryDictIOUtils {
     /**
      * Writes dictionary to file.
      */
+    @UsedForTesting
     public static void writeDictionary(final DictEncoder dictEncoder,
             final BigramDictionaryInterface dict, final UserHistoryDictionaryBigramList bigrams,
             final FormatOptions formatOptions) {