diff --git a/imagekit/generatedfiles/strategies.py b/imagekit/generatedfiles/strategies.py
index 72bc1df..7e19692 100644
--- a/imagekit/generatedfiles/strategies.py
+++ b/imagekit/generatedfiles/strategies.py
@@ -23,9 +23,6 @@ class Optimistic(object):
     def on_source_created(self, file):
         file.generate()
 
-    def on_source_deleted(self, file):
-        file.delete()
-
     def on_source_changed(self, file):
         file.generate()