diff --git a/hw/xfree86/common/modeline2c.pl b/hw/xfree86/common/modeline2c.pl
index abe995550..cc6c6925e 100644
--- a/hw/xfree86/common/modeline2c.pl
+++ b/hw/xfree86/common/modeline2c.pl
@@ -67,6 +67,10 @@ printf("/* \$$proj\$ */
  * Author: Dirk Hohndel <hohndel\@XFree86.Org>
  */
 
+#ifdef HAVE_XORG_CONFIG_H
+#include <xorg-config.h>
+#endif
+
 #ifdef __UNIXOS2__
 #define I_NEED_OS2_H
 #endif