diff --git a/phosphor-regulators/test/validate-regulators-config_tests.cpp b/phosphor-regulators/test/validate-regulators-config_tests.cpp
index 987a492..139b3ca 100644
--- a/phosphor-regulators/test/validate-regulators-config_tests.cpp
+++ b/phosphor-regulators/test/validate-regulators-config_tests.cpp
@@ -221,7 +221,7 @@
 
 void expectCommandLineSyntax(const std::string& expectedErrorMessage,
                              const std::string& expectedOutputMessage,
-                             std::string command, int status)
+                             const std::string& command, int status)
 {
     std::string errorMessage;
     std::string outputMessage;