diff --git a/sys/amd64/include/cpufunc.h b/sys/amd64/include/cpufunc.h
index 455681b1586e..e5127143e7df 100644
--- a/sys/amd64/include/cpufunc.h
+++ b/sys/amd64/include/cpufunc.h
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: cpufunc.h,v 1.20 1994/09/02 04:12:16 davidg Exp $
+ *	$Id: cpufunc.h,v 1.21 1994/09/15 16:27:12 paul Exp $
  */
 
 /*
@@ -46,6 +46,8 @@
 
 #include <machine/spl.h>
 
+#include <machine/pio.h>
+
 #ifdef	__GNUC__
 
 static inline int bdb(void)
diff --git a/sys/i386/include/cpufunc.h b/sys/i386/include/cpufunc.h
index 455681b1586e..e5127143e7df 100644
--- a/sys/i386/include/cpufunc.h
+++ b/sys/i386/include/cpufunc.h
@@ -30,7 +30,7 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: cpufunc.h,v 1.20 1994/09/02 04:12:16 davidg Exp $
+ *	$Id: cpufunc.h,v 1.21 1994/09/15 16:27:12 paul Exp $
  */
 
 /*
@@ -46,6 +46,8 @@
 
 #include <machine/spl.h>
 
+#include <machine/pio.h>
+
 #ifdef	__GNUC__
 
 static inline int bdb(void)