diff --git a/media/libeffects/visualizer/EffectVisualizer.cpp b/media/libeffects/visualizer/EffectVisualizer.cpp
index ec13557..8ab57c9 100644
--- a/media/libeffects/visualizer/EffectVisualizer.cpp
+++ b/media/libeffects/visualizer/EffectVisualizer.cpp
@@ -272,8 +272,8 @@
     return 0;
 }   // end Visualizer_process
 
-extern "C" int Visualizer_command(effect_interface_t self, int cmdCode, int cmdSize,
-        void *pCmdData, int *replySize, void *pReplyData) {
+extern "C" int Visualizer_command(effect_interface_t self, uint32_t cmdCode, uint32_t cmdSize,
+        void *pCmdData, uint32_t *replySize, void *pReplyData) {
 
     android::VisualizerContext * pContext = (android::VisualizerContext *)self;
     int retsize;