diff --git a/java/src/com/android/inputmethod/keyboard/Keyboard.java b/java/src/com/android/inputmethod/keyboard/Keyboard.java
index 3abe890cb..919850095 100644
--- a/java/src/com/android/inputmethod/keyboard/Keyboard.java
+++ b/java/src/com/android/inputmethod/keyboard/Keyboard.java
@@ -219,6 +219,11 @@ public class Keyboard {
         return code >= CODE_SPACE;
     }
 
+    @Override
+    public String toString() {
+        return mId.toString();
+    }
+
     public static class Params {
         public KeyboardId mId;
         public int mThemeId;