diff --git a/glm/gtc/matrix_transform.inl b/glm/gtc/matrix_transform.inl
index 790ecf55..90af5db6 100644
--- a/glm/gtc/matrix_transform.inl
+++ b/glm/gtc/matrix_transform.inl
@@ -237,9 +237,9 @@ namespace glm
 	)
 	{
 #ifdef GLM_FORCE_RADIANS
-		valType const rad = fov;
+		valType const rad = fovy;
 #else
-		valType const rad = glm::radians(fov);
+		valType const rad = glm::radians(fovy);
 #endif
         
 		valType range = tan(radians(rad / valType(2))) * zNear;