diff --git a/controller/include/msp_MK32.h b/controller/include/msp_MK32.h
index e43a254..dc768d3 100644
--- a/controller/include/msp_MK32.h
+++ b/controller/include/msp_MK32.h
@@ -118,6 +118,7 @@ typedef void (*ActionFunc)(void);
 /*==============================================*
  *      routines' or functions' implementations *
  *----------------------------------------------*/
+void MK32_Key_Func(SP_MSP_MK32_Button *_pstMK32, int _iMode, int _iSubMode);
 
 #ifdef __cplusplus
 #if __cplusplus