diff --git a/hal/platform_api.h b/hal/platform_api.h
index 98e4223..e500da5 100644
--- a/hal/platform_api.h
+++ b/hal/platform_api.h
@@ -18,7 +18,7 @@
 #define AUDIO_PLATFORM_API_H
 
 #include "voice.h"
-#define MAX_VOLUME_CAL_STEPS 15
+#define MAX_VOLUME_CAL_STEPS 25
 #define CODEC_BACKEND_DEFAULT_SAMPLE_RATE 48000
 #define CODEC_BACKEND_DEFAULT_BIT_WIDTH 16
 #define CODEC_BACKEND_DEFAULT_CHANNELS 2