diff --git a/doc/tutorial.md b/doc/tutorial.md
index 0674dee4c33..04397642415 100644
--- a/doc/tutorial.md
+++ b/doc/tutorial.md
@@ -1913,7 +1913,7 @@ struct TimeBomb {
 }
 
 impl TimeBomb : Drop {
-    fn finalize() {
+    fn finalize(&self) {
         for iter::repeat(self.explosivity) {
             io::println("blam!");
         }