diff --git a/toys/posix/ls.c b/toys/posix/ls.c
index da0a142..8dc5536 100644
--- a/toys/posix/ls.c
+++ b/toys/posix/ls.c
@@ -413,7 +413,7 @@
         xputc('\n');
         width = 0;
       } else {
-        printf("  "+mm);
+        printf("  "+mm, 0); // shut up the stupid compiler
         width += 2-mm;
       }
     }