diff --git a/gns3server/utils/images.py b/gns3server/utils/images.py
index 794d19e7..8cd76143 100644
--- a/gns3server/utils/images.py
+++ b/gns3server/utils/images.py
@@ -156,7 +156,7 @@ def md5sum(path):
 
     try:
         with open(path + '.md5sum') as f:
-            md5 = f.read()
+            md5 = f.read().strip()
             if len(md5) == 32:
                 return md5
     # Unicode error is when user rename an image to .md5sum ....