diff --git a/visudo.c b/visudo.c
index d7cfc18c4..d699755bb 100644
--- a/visudo.c
+++ b/visudo.c
@@ -30,6 +30,7 @@
 * edit, lock and parse the sudoers file in a fashion similiar to /etc/vipw.
 *******************************************************************************/
 #include <sys/types.h>
+#include <sys/param.h>
 #include <sys/stat.h>
 #include <sys/file.h>
 #include <stdio.h>