diff --git a/include/omath/Mat.hpp b/include/omath/Mat.hpp
index c41bfb9..c68dc95 100644
--- a/include/omath/Mat.hpp
+++ b/include/omath/Mat.hpp
@@ -116,7 +116,7 @@ namespace omath
             return result;
         }
 
-        constexpr Mat &operator*=(Type f) noexcept
+        constexpr Mat &operator*=(const Type& f) noexcept
         {
             for (size_t i = 0; i < Rows; ++i)
                 for (size_t j = 0; j < Columns; ++j)