diff --git a/code/application/source/cardv/SrcCode/UIWnd/LVGL_SPORTCAM/UIFlowLVGL/UIFlowPlay/UIFlowPlayEventCallback.c b/code/application/source/cardv/SrcCode/UIWnd/LVGL_SPORTCAM/UIFlowLVGL/UIFlowPlay/UIFlowPlayEventCallback.c
index 1cd57d4af..3a5e2587a 100755
--- a/code/application/source/cardv/SrcCode/UIWnd/LVGL_SPORTCAM/UIFlowLVGL/UIFlowPlay/UIFlowPlayEventCallback.c
+++ b/code/application/source/cardv/SrcCode/UIWnd/LVGL_SPORTCAM/UIFlowLVGL/UIFlowPlay/UIFlowPlayEventCallback.c
@@ -27,7 +27,7 @@
 //#define PLAY_KEY_PRESS_MASK        (FLGKEY_KEY_MASK_DEFAULT)
 //#define PLAY_KEY_RELEASE_MASK      FLGKEY_KEY_MASK_NULL//(FLGKEY_UP | FLGKEY_DOWN | FLGKEY_LEFT | FLGKEY_RIGHT)
 //#define PLAY_KEY_CONTINUE_MASK     FLGKEY_KEY_CONT_MASK_DEFAULT
-extern SF_ST_MMC_DEV *mmc_dev;
+static SF_ST_MMC_DEV *mmc_dev = NULL;
 //static lv_obj_t* pMenu = NULL;
 enum SELECTION_SHOW
 {