diff --git a/audio_effects/include/audio_effects/effect_visualizer.h b/audio_effects/include/audio_effects/effect_visualizer.h
index cfd99f5..fe46d7f 100644
--- a/audio_effects/include/audio_effects/effect_visualizer.h
+++ b/audio_effects/include/audio_effects/effect_visualizer.h
@@ -41,6 +41,7 @@
 
 #define MEASUREMENT_IDX_PEAK 0
 #define MEASUREMENT_IDX_RMS  1
+#define MEASUREMENT_COUNT 2
 
 /* enumerated parameters for Visualizer effect */
 typedef enum