diff --git a/Android.mk b/Android.mk
index ee1a82adb..e45357911 100755
--- a/Android.mk
+++ b/Android.mk
@@ -17,5 +17,7 @@ LOCAL_STATIC_JAVA_LIBRARIES := android-common
 
 #LOCAL_SDK_VERSION := current
 
+LOCAL_PROGUARD_FLAGS := -include $(LOCAL_PATH)/proguard.flags
+
 include $(BUILD_PACKAGE)
 include $(LOCAL_PATH)/dictionary/Android.mk
diff --git a/proguard.flags b/proguard.flags
new file mode 100644
index 000000000..0a5d2dda9
--- /dev/null
+++ b/proguard.flags
@@ -0,0 +1,3 @@
+-keep class com.android.inputmethod.latin.BinaryDictionary {
+  int mDictLength;
+}