diff --git a/poky/scripts/lib/devtool/upgrade.py b/poky/scripts/lib/devtool/upgrade.py
index cb6dce3..f962a71 100644
--- a/poky/scripts/lib/devtool/upgrade.py
+++ b/poky/scripts/lib/devtool/upgrade.py
@@ -391,12 +391,12 @@
             newvalues['SRC_URI[%s.md5sum]' % name] = None
             newvalues['SRC_URI[%s.sha256sum]' % name] = None
 
-    if md5 and sha256:
+    if sha256:
         if addnames:
             nameprefix = '%s.' % addnames[0]
         else:
             nameprefix = ''
-        newvalues['SRC_URI[%smd5sum]' % nameprefix] = md5
+        newvalues['SRC_URI[%smd5sum]' % nameprefix] = None
         newvalues['SRC_URI[%ssha256sum]' % nameprefix] = sha256
 
     if srcsubdir_new != srcsubdir_old: