diff --git a/tests/hwc/Android.mk b/tests/hwc/Android.mk
index 0416ff1..a5f59f1 100644
--- a/tests/hwc/Android.mk
+++ b/tests/hwc/Android.mk
@@ -1,9 +1,9 @@
 LOCAL_PATH:= $(call my-dir)
 
 include $(CLEAR_VARS)
-LOCAL_MODULE := libcnativewindow 
+LOCAL_MODULE := libcnativewindow
 LOCAL_SRC_FILES := cnativewindow.c util.c
-LOCAL_CFLAGS := -Wno-unused-parameter
+LOCAL_CFLAGS := -Wall -Werror -Wno-unused-parameter
 LOCAL_SHARED_LIBRARIES := libEGL libGLESv2 libdl libhardware libnativewindow
 include $(BUILD_STATIC_LIBRARY)
 
@@ -12,5 +12,5 @@
 LOCAL_SRC_FILES := test-arrows.c
 LOCAL_STATIC_LIBRARIES := libcnativewindow
 LOCAL_SHARED_LIBRARIES := libEGL libGLESv2 libdl libhardware libnativewindow
-LOCAL_CFLAGS := -DGL_GLEXT_PROTOTYPES
+LOCAL_CFLAGS := -DGL_GLEXT_PROTOTYPES -Wall -Werror
 include $(BUILD_EXECUTABLE)