diff --git a/support-lib/objc/DJFuture.h b/support-lib/objc/DJFuture.h
index c456cfe5..a62b3db3 100644
--- a/support-lib/objc/DJFuture.h
+++ b/support-lib/objc/DJFuture.h
@@ -25,7 +25,7 @@
 // If the future is ready, then calling its `get` method will not block.
 - (BOOL) isReady;
 // Block and wait for the result (or exception). This can only be called once.
-- (nullable DJValue) get;
+- (nonnull DJValue) get;
 // Tell the future to Call the specified handler routine when it becomes
 // ready. Returns a new future that wraps the return value of the handler
 // routine. The current future becomes invalid after this call.