diff --git a/presubmit_canned_checks.py b/presubmit_canned_checks.py
index 68b981908..aecdd83fa 100644
--- a/presubmit_canned_checks.py
+++ b/presubmit_canned_checks.py
@@ -228,7 +228,7 @@ def CheckChangeHasNoCrAndHasOnlyOneEol(input_api, output_api,
 
 def _ReportErrorFileAndLine(filename, line_num, dummy_line):
   """Default error formatter for _FindNewViolationsOfRule."""
-  return '%s, line %s' % (filename, line_num)
+  return '%s:%s' % (filename, line_num)
 
 
 def _FindNewViolationsOfRule(callable_rule, input_api, source_file_filter=None,
diff --git a/tests/presubmit_unittest.py b/tests/presubmit_unittest.py
index f97121a7b..34f0b489e 100755
--- a/tests/presubmit_unittest.py
+++ b/tests/presubmit_unittest.py
@@ -2053,7 +2053,7 @@ class CannedChecksUnittest(PresubmitTestsBase):
     self.assertEquals(results1[0].__class__,
         presubmit.OutputApi.PresubmitPromptWarning)
     self.assertEquals(results1[0]._long_text,
-        'makefile.foo, line 46')
+        'makefile.foo:46')
 
   def testCannedCheckLongLines(self):
     check = lambda x, y, z: presubmit_canned_checks.CheckLongLines(x, y, 10, z)