diff --git a/poky/scripts/combo-layer b/poky/scripts/combo-layer
index 2312cef..4a71591 100755
--- a/poky/scripts/combo-layer
+++ b/poky/scripts/combo-layer
@@ -483,7 +483,7 @@
         exit if repo is dirty
     """
     output=runcmd("git status --porcelain", repodir)
-    r = re.compile('\?\? patch-.*/')
+    r = re.compile(r'\?\? patch-.*/')
     dirtyout = [item for item in output.splitlines() if not r.match(item)]
     if dirtyout:
         logger.error("git repo %s is dirty, please fix it first", repodir)