diff --git a/sys/i386/i386/elan-mmcr.c b/sys/i386/i386/elan-mmcr.c
index 7ddd90cbda44..c36a154bb501 100644
--- a/sys/i386/i386/elan-mmcr.c
+++ b/sys/i386/i386/elan-mmcr.c
@@ -27,6 +27,7 @@
  * #endif ELAN_PPS
  */
 
+#include "opt_cpu.h"
 #include <sys/param.h>
 #include <sys/systm.h>
 #include <sys/kernel.h>