1 files changed, 3 insertions, 2 deletions
diff --git a/uunit.h b/uunit.h
index 447d27a..f11fa1c 100644
--- a/uunit.h
+++ b/uunit.h
@@ -206,8 +206,9 @@ protected:
 			throw test_result{"", file, line, ss.str()};
 		}
 	}
-	template<typename T>
-	void assert_equal(T expected, T value,
+
+	template<typename T, typename U>
+	void assert_equal(const T& expected, const U& value,
 	                  const char* file, std::size_t line)
 	{
 		if(expected != value)