diff --git a/fs/fat/os_adapt/fatfs.c b/fs/fat/os_adapt/fatfs.c
index 1bf4173ab93478a1d2ccf9017f69698317b62acf..94fc5c5613f54bdce24b3fa4d02db73c561a222e 100644
--- a/fs/fat/os_adapt/fatfs.c
+++ b/fs/fat/os_adapt/fatfs.c
@@ -490,7 +490,7 @@ int fatfs_unbind(void *handle, struct inode **blkdriver)
     SETUP_SEARCH(&desc, g_fatVirPart.virtualinfo.devpartpath, false);
     FatfsVirtLock();
     result = FatFsUnbindVirPart(fat);
-    FatfsVirtLock();
+    FatfsVirtUnlock();
     if (result == FR_OK) {
         part = los_part_find(DiskDev[index]);
         (void)inode_find(&desc);