diff --git a/include/GLFW/glfw3native.h b/include/GLFW/glfw3native.h
index f8e6662e..9915106a 100644
--- a/include/GLFW/glfw3native.h
+++ b/include/GLFW/glfw3native.h
@@ -81,6 +81,7 @@ extern "C" {
  #endif
 #elif defined(GLFW_EXPOSE_NATIVE_X11)
  #include <X11/Xlib.h>
+ #include <X11/extensions/Xrandr.h>
 #else
  #error "No window API specified"
 #endif