diff --git a/glm/gtc/matrix_transform.hpp b/glm/gtc/matrix_transform.hpp
index 1a9f0bac..6ea71aea 100644
--- a/glm/gtc/matrix_transform.hpp
+++ b/glm/gtc/matrix_transform.hpp
@@ -51,6 +51,7 @@
 #include "../vec2.hpp"
 #include "../vec3.hpp"
 #include "../vec4.hpp"
+#include "../gtc/constants.hpp"
 
 #if(defined(GLM_MESSAGES) && !defined(GLM_EXT_INCLUDED))
 #	pragma message("GLM: GLM_GTC_matrix_transform extension included")
diff --git a/glm/gtc/matrix_transform.inl b/glm/gtc/matrix_transform.inl
index 03d201c6..31fa2cc3 100644
--- a/glm/gtc/matrix_transform.inl
+++ b/glm/gtc/matrix_transform.inl
@@ -267,7 +267,7 @@ namespace glm
 		T h = glm::cos(static_cast<T>(0.5) * rad) / glm::sin(static_cast<T>(0.5) * rad);
 		T w = h * height / width; ///todo max(width , Height) / min(width , Height)?
 
-		detail::tmat4x4<valType, defaultp> Result(static_cast<T>(0));
+		detail::tmat4x4<T, defaultp> Result(static_cast<T>(0));
 		Result[0][0] = w;
 		Result[1][1] = h;
 		Result[2][2] = - (zFar + zNear) / (zFar - zNear);