diff --git a/src/glx/glxclient.h b/src/glx/glxclient.h
index f3a36cf106b..df51f2b8ce4 100644
--- a/src/glx/glxclient.h
+++ b/src/glx/glxclient.h
@@ -646,8 +646,6 @@ extern void __glXSendLargeCommand(struct glx_context *, const GLvoid *, GLint,
 /* Initialize the GLX extension for dpy */
 extern struct glx_display *__glXInitialize(Display *);
 
-extern void __glXPreferEGL(int state);
-
 /************************************************************************/
 
 extern int __glXDebug;