diff --git a/bsp/fh8620/libraries/inc/fh_mmc.h b/bsp/fh8620/libraries/inc/fh_mmc.h
index 86979b2264..4aaf416ce6 100644
--- a/bsp/fh8620/libraries/inc/fh_mmc.h
+++ b/bsp/fh8620/libraries/inc/fh_mmc.h
@@ -284,25 +284,6 @@ rt_inline rt_uint32_t MMC_IsDataStateBusy(struct fh_mmc_obj *mmc_obj)
     return (GET_REG(mmc_obj->base + OFFSET_SDC_STATUS) >> 10) & 0x1;
 }
 
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 void MMC_Init(struct fh_mmc_obj *mmc_obj);
 int MMC_ResetFifo(struct fh_mmc_obj *mmc_obj);
 int MMC_SetCardWidth(struct fh_mmc_obj *mmc_obj, int width);