diff --git a/testing/util.py b/testing/util.py
index 50b45857..91a44bab 100644
--- a/testing/util.py
+++ b/testing/util.py
@@ -67,7 +67,7 @@ xfailif_broken_deep_listdir = pytest.mark.xfail(
 
 
 def platform_supports_pcre():
-    output = cmd_output(GREP, '-P', "name=Don't", 'CHANGELOG.md', retcode=None)
+    output = cmd_output(GREP, '-P', "Don't", 'CHANGELOG.md', retcode=None)
     return output[0] == 0 and "name='pre_commit'," in output[1]