diff --git a/glm/detail/_noise.hpp b/glm/detail/_noise.hpp
index 89403f4a..d7d7d186 100644
--- a/glm/detail/_noise.hpp
+++ b/glm/detail/_noise.hpp
@@ -14,7 +14,7 @@ namespace detail
 	template <typename T>
 	GLM_FUNC_QUALIFIER T mod289(T const & x)
 	{
-		return x - floor(x * static_cast<T>(1.0) / static_cast<T>(289.0)) * static_cast<T>(289.0);
+		return x - floor(x * (static_cast<T>(1.0) / static_cast<T>(289.0))) * static_cast<T>(289.0);
 	}
 
 	template <typename T>
diff --git a/readme.md b/readme.md
index 3df46310..6c4a47e4 100644
--- a/readme.md
+++ b/readme.md
@@ -63,6 +63,7 @@ glm::mat4 camera(float Translate, glm::vec2 const & Rotate)
 - Added lowp variant of GTC_colorspace convertLinearToSRGB #419
 - Replaced the manual by a markdown version #458
 - Optimized GTC_packing implementation
+- Optimized noise functions
 - Added FAQ 12: Windows headers cause build errors... #557
 
 #### Fixes: