diff --git a/sys/lib/man/permind/ptx1.c b/sys/lib/man/permind/ptx1.c
index fac218d7c..486d3d5a5 100644
--- a/sys/lib/man/permind/ptx1.c
+++ b/sys/lib/man/permind/ptx1.c
@@ -108,6 +108,7 @@ FILE *bptr;
 
 char *cmds;
 
+void
 main(int argc, char **argv)
 {
 	int c;