diff --git a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
index 9385ba3..3f26ff3 100644
--- a/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
+++ b/java/src/com/android/inputmethod/latin/makedict/Ver3DictEncoder.java
@@ -68,6 +68,12 @@
     @Override
     public void writeDictionary(final FusionDictionary dict, final FormatOptions formatOptions)
             throws IOException, UnsupportedFormatException {
+        if (formatOptions.mVersion > 3) {
+            throw new UnsupportedFormatException(
+                    "The given format options has wrong version number : "
+                    + formatOptions.mVersion);
+        }
+
         if (mOutStream == null) {
             openStream();
         }