diff --git a/media/libeffects/visualizer/Android.mk b/media/libeffects/visualizer/Android.mk
index c92c543..ddcc565 100644
--- a/media/libeffects/visualizer/Android.mk
+++ b/media/libeffects/visualizer/Android.mk
@@ -7,6 +7,7 @@
 	EffectVisualizer.cpp
 
 LOCAL_CFLAGS+= -O2 -fvisibility=hidden
+LOCAL_CFLAGS += -Wall -Werror
 
 LOCAL_SHARED_LIBRARIES := \
 	libcutils \
diff --git a/media/libeffects/visualizer/EffectVisualizer.cpp b/media/libeffects/visualizer/EffectVisualizer.cpp
index 6ed9a43..0f65939 100644
--- a/media/libeffects/visualizer/EffectVisualizer.cpp
+++ b/media/libeffects/visualizer/EffectVisualizer.cpp
@@ -233,7 +233,6 @@
                          int32_t /*ioId*/,
                          effect_handle_t *pHandle) {
     int ret;
-    int i;
 
     if (pHandle == NULL || uuid == NULL) {
         return -EINVAL;
@@ -415,7 +414,6 @@
         void *pCmdData, uint32_t *replySize, void *pReplyData) {
 
     VisualizerContext * pContext = (VisualizerContext *)self;
-    int retsize;
 
     if (pContext == NULL || pContext->mState == VISUALIZER_STATE_UNINITIALIZED) {
         return -EINVAL;