diff --git a/hw/xfree86/common/xf86Priv.h b/hw/xfree86/common/xf86Priv.h
index 1196064cc..845744338 100644
--- a/hw/xfree86/common/xf86Priv.h
+++ b/hw/xfree86/common/xf86Priv.h
@@ -56,7 +56,9 @@ extern _X_EXPORT  Bool xf86sFlag;
 extern _X_EXPORT  Bool xf86bsEnableFlag;
 extern _X_EXPORT  Bool xf86bsDisableFlag;
 extern _X_EXPORT  Bool xf86silkenMouseDisableFlag;
+#ifdef HAVE_ACPI
 extern _X_EXPORT  Bool xf86acpiDisableFlag;
+#endif
 extern _X_EXPORT  char *xf86LayoutName;
 extern _X_EXPORT  char *xf86ScreenName;
 extern _X_EXPORT  char *xf86PointerName;