diff --git a/lib/internal/streams/from.js b/lib/internal/streams/from.js
index 906ddcf9af844b..d3d43f7dfbb8ec 100644
--- a/lib/internal/streams/from.js
+++ b/lib/internal/streams/from.js
@@ -25,7 +25,7 @@ function from(Readable, iterable, opts) {
     });
   }
 
-  let isAsync = false;
+  let isAsync;
   if (iterable && iterable[SymbolAsyncIterator]) {
     isAsync = true;
     iterator = iterable[SymbolAsyncIterator]();