diff --git a/libc/include/sys/param.h b/libc/include/sys/param.h
index 5d2248f..d3686e0 100644
--- a/libc/include/sys/param.h
+++ b/libc/include/sys/param.h
@@ -25,11 +25,13 @@
  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  */
+
 #ifndef _SYS_PARAM_H_
 #define _SYS_PARAM_H_
 
 #include <limits.h>
 #include <linux/param.h>
+#include <sys/cdefs.h>
 
 #define DEV_BSIZE 512