diff --git a/packages/TtsService/Android.mk b/packages/TtsService/Android.mk
index 75b26a245ed3e..a1a3b9f77e01b 100644
--- a/packages/TtsService/Android.mk
+++ b/packages/TtsService/Android.mk
@@ -8,7 +8,7 @@ LOCAL_SRC_FILES := $(call all-subdir-java-files) \
 LOCAL_PACKAGE_NAME := TtsService
 LOCAL_CERTIFICATE := platform
 
-LOCAL_PROGUARD_FLAGS := -include $(LOCAL_PATH)/proguard.flags
+LOCAL_PROGUARD_FLAG_FILES := proguard.flags
 
 include $(BUILD_PACKAGE)