diff --git a/Tests/RunCMake/CTestCommandLine/show-only_json-v1_check.py b/Tests/RunCMake/CTestCommandLine/show-only_json-v1_check.py
index f9667aeace..cf1262212b 100644
--- a/Tests/RunCMake/CTestCommandLine/show-only_json-v1_check.py
+++ b/Tests/RunCMake/CTestCommandLine/show-only_json-v1_check.py
@@ -57,7 +57,7 @@ def check_command(c):
     assert is_list(c)
     assert len(c) == 3
     assert is_string(c[0])
-    check_re(c[0], "/cmake(\.exe)?$")
+    check_re(c[0], r"/cmake(\.exe)?$")
     assert is_string(c[1])
     assert c[1] == "-E"
     assert is_string(c[2])