s/didFinishWithError/writesFinishedWithError
diff --git a/src/objective-c/RxLibrary/GRXImmediateWriter.m b/src/objective-c/RxLibrary/GRXImmediateWriter.m
index 7108a56..0b49798 100644
--- a/src/objective-c/RxLibrary/GRXImmediateWriter.m
+++ b/src/objective-c/RxLibrary/GRXImmediateWriter.m
@@ -130,7 +130,7 @@
   _errorOrNil = nil;
   id<GRXWriteable> writeable = _writeable;
   _writeable = nil;
-  [writeable didFinishWithError:errorOrNil];
+  [writeable writesFinishedWithError:errorOrNil];
 }
 
 - (void)setState:(GRXWriterState)newState {