diff --git a/tools/tools/ioat/ioatcontrol.c b/tools/tools/ioat/ioatcontrol.c
index c9c1a29c5d25..7cfb816f4346 100644
--- a/tools/tools/ioat/ioatcontrol.c
+++ b/tools/tools/ioat/ioatcontrol.c
@@ -24,6 +24,7 @@
  * SUCH DAMAGE.
  */
 
+#include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
 #include <sys/ioctl.h>