diff --git a/test/reporter_output_test.cc b/test/reporter_output_test.cc
index 80f3e786..99fe2c20 100644
--- a/test/reporter_output_test.cc
+++ b/test/reporter_output_test.cc
@@ -17,7 +17,7 @@ static int AddContextCases() {
            {
                {"%int[-/]%int[-/]%int %int:%int:%int$", MR_Default},
                {"Running .*/reporter_output_test(\\.exe)?$", MR_Next},
-               {"Run on \\(%int X %float MHz CPU s\\)", MR_Next},
+               {"Run on \\(%int X %float MHz CPU s?\\)", MR_Next},
            });
   AddCases(TC_JSONOut,
            {{"^\\{", MR_Default},