diff --git a/GL/glx/glxext.c b/GL/glx/glxext.c
index 1f6c7f376..ca874e33b 100644
--- a/GL/glx/glxext.c
+++ b/GL/glx/glxext.c
@@ -275,7 +275,7 @@ static GLboolean errorOccured = GL_FALSE;
 /*
 ** The GL was will call this routine if an error occurs.
 */
-void __glXErrorCallBack(__GLinterface *gc, GLenum code)
+void __glXErrorCallBack(GLenum code)
 {
     errorOccured = GL_TRUE;
 }
diff --git a/GL/glx/glxext.h b/GL/glx/glxext.h
index edd66a8f0..dc4cd4afe 100644
--- a/GL/glx/glxext.h
+++ b/GL/glx/glxext.h
@@ -66,7 +66,7 @@ typedef struct {
 extern GLboolean __glXFreeContext(__GLXcontext *glxc);
 extern void __glXFlushContextCache(void);
 
-extern void __glXErrorCallBack(__GLinterface *gc, GLenum code);
+extern void __glXErrorCallBack(GLenum code);
 extern void __glXClearErrorOccured(void);
 extern GLboolean __glXErrorOccured(void);
 extern void __glXResetLargeCommandStatus(__GLXclientState*);