diff --git a/utils/general.py b/utils/general.py
index b3253b112..86c584228 100755
--- a/utils/general.py
+++ b/utils/general.py
@@ -948,7 +948,7 @@ def increment_dir(dir, comment=''):
     dir = str(Path(dir))  # os-agnostic
     d = sorted(glob.glob(dir + '*'))  # directories
     if len(d):
-        n = max([int(x[len(dir):x.find('_') if '_' in x else None]) for x in d]) + 1  # increment
+        n = max([int(x[len(dir):x.rfind('_') if '_' in Path(x).name else None]) for x in d]) + 1  # increment
     return dir + str(n) + ('_' + comment if comment else '')