diff --git a/gfx/drivers_context/x_ctx.c b/gfx/drivers_context/x_ctx.c
index cd02af7894..6428a1f8e7 100644
--- a/gfx/drivers_context/x_ctx.c
+++ b/gfx/drivers_context/x_ctx.c
@@ -25,6 +25,7 @@
 
 #if defined(HAVE_OPENGL) || defined(HAVE_OPENGL1) || defined(HAVE_OPENGL_CORE)
 #include <GL/glx.h>
+#include <glsym/rglgen.h>
 
 #ifndef GLX_SAMPLE_BUFFERS
 #define GLX_SAMPLE_BUFFERS 100000