diff --git a/base.rs b/base.rs
index dffec2d..c1e0d36 100644
--- a/base.rs
+++ b/base.rs
@@ -64,7 +64,7 @@ mod test {
 
         unsafe {
             let nsapp = objc_msgSend(klass, sel);
-            io::println(fmt!("nsapp: %d", (nsapp as int)));
+            io::println(format!("nsapp: {:d}", (nsapp as int)));
         }
     }