diff --git a/scripts/combo-layer b/scripts/combo-layer
index f8763ee..d6d238d 100755
--- a/scripts/combo-layer
+++ b/scripts/combo-layer
@@ -218,7 +218,7 @@ def action_update(conf, args):
         logger.debug("generated patch set:\n%s" % output)
         patchlist = output.splitlines()
 
-        rev_cmd = 'git log --pretty=format:"%H" ' + rev_cmd_range
+        rev_cmd = 'git rev-list --no-merges ' + rev_cmd_range
         revlist = runcmd(rev_cmd, ldir).splitlines()
 
         # Step 3: Call repo specific hook to adjust patch