diff --git a/torchvision/datasets/lsun.py b/torchvision/datasets/lsun.py
index e165b957c67..1612e03063c 100644
--- a/torchvision/datasets/lsun.py
+++ b/torchvision/datasets/lsun.py
@@ -81,7 +81,7 @@ def __init__(self, db_path, classes='train',
                 classes = [classes]
             else:
                 classes = [c + '_' + classes for c in categories]
-        if type(classes) == list:
+        elif type(classes) == list:
             for c in classes:
                 c_short = c.split('_')
                 c_short.pop(len(c_short) - 1)