diff --git a/gns3server/utils/images.py b/gns3server/utils/images.py
index 02055a65..69234518 100644
--- a/gns3server/utils/images.py
+++ b/gns3server/utils/images.py
@@ -36,7 +36,8 @@ def md5sum(path):
     try:
         with open(path + '.md5sum') as f:
             return f.read()
-    except OSError:
+    # Unicode error is when user rename an image to .md5sum ....
+    except (OSError, UnicodeDecodeError):
         pass
 
     try: