diff --git a/include/internal/TestCPPTestCase.h b/include/internal/TestCPPTestCase.h
index 2edfe26..d0335b2 100644
--- a/include/internal/TestCPPTestCase.h
+++ b/include/internal/TestCPPTestCase.h
@@ -296,7 +296,7 @@ namespace TestCPP {
          * @param failureMessage The error message from the test that
          *          should be logged.
          */
-        void logTestFailure (string failureMessage);
+        void logTestFailure (const string& failureMessage);
         /**
          * @brief Internal test run controller.
          */
diff --git a/src/TestCPPTestCase.cpp b/src/TestCPPTestCase.cpp
index c032288..f013121 100644
--- a/src/TestCPPTestCase.cpp
+++ b/src/TestCPPTestCase.cpp
@@ -301,7 +301,7 @@ namespace TestCPP {
         out << TCPPStr::REASON_ << reason << endl;
     }
 
-    void TestCase::logTestFailure (string reason) {
+    void TestCase::logTestFailure (const string& reason) {
         unique_ptr<ostream> logStream = nullptr;
 
         if (this->clogOriginal.get() != nullptr) {