diff --git a/MLPAutoCompleteTextField/MLPAutoCompleteTextField.m b/MLPAutoCompleteTextField/MLPAutoCompleteTextField.m
index 674b4a9..3e5a3fa 100644
--- a/MLPAutoCompleteTextField/MLPAutoCompleteTextField.m
+++ b/MLPAutoCompleteTextField/MLPAutoCompleteTextField.m
@@ -27,7 +27,7 @@
 @interface MLPAutoCompleteSortOperation: NSOperation
 @property (strong) NSString *incompleteString;
 @property (strong) NSArray *possibleCompletions;
-@property (strong) id <MLPAutoCompleteSortOperationDelegate> delegate;
+@property (weak) id <MLPAutoCompleteSortOperationDelegate> delegate;
 @property (strong) NSDictionary *boldTextAttributes;
 @property (strong) NSDictionary *regularTextAttributes;