diff --git a/bin/rmdir/Makefile b/bin/rmdir/Makefile
index c2c7f301ce49..fe1b7d97871f 100644
--- a/bin/rmdir/Makefile
+++ b/bin/rmdir/Makefile
@@ -3,4 +3,6 @@
 
 PROG=	rmdir
 
+WARNS=	2
+
 .include <bsd.prog.mk>
diff --git a/bin/rmdir/rmdir.c b/bin/rmdir/rmdir.c
index 5c16c3d78808..e7c625b792e8 100644
--- a/bin/rmdir/rmdir.c
+++ b/bin/rmdir/rmdir.c
@@ -52,6 +52,7 @@ static const char rcsid[] =
 #include <string.h>
 #include <unistd.h>
 
+int main __P((int, char *[]));
 int rm_path __P((char *));
 void usage __P((void));