diff --git a/getconf.c b/getconf.c
index fdebc58..ca3e186 100644
--- a/getconf.c
+++ b/getconf.c
@@ -103,4 +103,6 @@ main(int argc, char *argv[])
 	}
 
 	eprintf("invalid variable: %s\n", argv[0]);
+
+	return 0;
 }