diff --git a/utils/checkstyle.py b/utils/checkstyle.py
index 41cd3371e..93f02911f 100755
--- a/utils/checkstyle.py
+++ b/utils/checkstyle.py
@@ -102,7 +102,7 @@ class DiffHunkSide(object):
 
 
 class DiffHunk(object):
-    diff_header_regex = re.compile(r'@@ -([0-9]+),([0-9]+) \+([0-9]+),([0-9]+) @@')
+    diff_header_regex = re.compile(r'@@ -([0-9]+),?([0-9]+)? \+([0-9]+),?([0-9]+)? @@')
 
     def __init__(self, line):
         match = DiffHunk.diff_header_regex.match(line)