diff --git a/hw/xfree86/x86emu/x86emu/debug.h b/hw/xfree86/x86emu/x86emu/debug.h
index c32743c6a..98d85e9b9 100644
--- a/hw/xfree86/x86emu/x86emu/debug.h
+++ b/hw/xfree86/x86emu/x86emu/debug.h
@@ -39,6 +39,8 @@
 #ifndef __X86EMU_DEBUG_H
 #define __X86EMU_DEBUG_H
 
+#include <X11/Xfuncproto.h>
+
 /*---------------------- Macros and type definitions ----------------------*/
 
 /* checks to be enabled for "runtime" */