diff --git a/components/dfs/src/dfs_fs.c b/components/dfs/src/dfs_fs.c
index 0f69ad2e3ec9fb7a31affd34514f466aaeb5f8a1..04d862e85db2164cac72ad6f3c543c5845037c1c 100644
--- a/components/dfs/src/dfs_fs.c
+++ b/components/dfs/src/dfs_fs.c
@@ -444,7 +444,7 @@ int dfs_mkfs(const char *fs_name, const char *device_name)
     /* lock file system */
     dfs_lock();
     /* find the file system operations */
-    for (index = 0; index <= DFS_FILESYSTEM_TYPES_MAX; index ++)
+    for (index = 0; index < DFS_FILESYSTEM_TYPES_MAX; index ++)
     {
         if (filesystem_operation_table[index] != NULL &&
             strcmp(filesystem_operation_table[index]->name, fs_name) == 0)
@@ -452,7 +452,7 @@ int dfs_mkfs(const char *fs_name, const char *device_name)
     }
     dfs_unlock();
 
-    if (index <= DFS_FILESYSTEM_TYPES_MAX)
+    if (index < DFS_FILESYSTEM_TYPES_MAX)
     {
         /* find file system operation */
         const struct dfs_filesystem_ops *ops = filesystem_operation_table[index];