diff --git a/test/zone_mock.hpp b/test/zone_mock.hpp
index 8dbf24a..79947fb 100644
--- a/test/zone_mock.hpp
+++ b/test/zone_mock.hpp
@@ -16,5 +16,5 @@
     MOCK_CONST_METHOD0(getMaxRPMRequest, float());
     MOCK_CONST_METHOD0(getFailSafeMode, bool());
     MOCK_CONST_METHOD0(getFailSafePercent, float());
-    MOCK_METHOD1(getSensor, Sensor*(std::string));
+    MOCK_METHOD1(getSensor, Sensor*(const std::string&));
 };