diff --git a/src/SFML/Graphics/GLExtensions.cpp b/src/SFML/Graphics/GLExtensions.cpp
index 83afa8619..1b7862de6 100644
--- a/src/SFML/Graphics/GLExtensions.cpp
+++ b/src/SFML/Graphics/GLExtensions.cpp
@@ -26,6 +26,7 @@
 // Headers
 ////////////////////////////////////////////////////////////
 #include <SFML/Graphics/GLExtensions.hpp>
+#include <SFML/System/Err.hpp>
 
 
 namespace sf