diff --git a/mmdet/utils/misc.py b/mmdet/utils/misc.py
index cf6ff690efb..4113672acfb 100644
--- a/mmdet/utils/misc.py
+++ b/mmdet/utils/misc.py
@@ -52,18 +52,15 @@ def update_data_root(cfg, logger=None):
         cfg (mmcv.Config): The model config need to modify
         logger (logging.Logger | str | None): the way to print msg
     """
-   assert isinstance(cfg, mmcv.Config), \
+    assert isinstance(cfg, mmcv.Config), \
         f'cfg got wrong type: {type(cfg)}, expected mmcv.Config'
-        
-    if 'MMDET_DATASETS'  in os.environ:
-         dst_root = os.environ['MMDET_DATASETS']
-         print_log(f'MMDET_DATASETS has been set to be {dst_root}. \
-                Using {dst_root} as data root.')
-        return
-    else:
+
+    if 'MMDET_DATASETS' in os.environ:
         dst_root = os.environ['MMDET_DATASETS']
-        print_log(f'MMDET_DATASETS has been set to be {dst_root}. \
-                Using {dst_root} as datat root.')
+        print_log(f'MMDET_DATASETS has been set to be {dst_root}.'
+                  f'Using {dst_root} as data root.')
+    else:
+        return
 
     assert isinstance(cfg, mmcv.Config), \
         f'cfg got wrong type: {type(cfg)}, expected mmcv.Config'