diff --git a/packages/wasi/src/wasienv.pas b/packages/wasi/src/wasienv.pas
index 8a4564b..881419a 100644
--- a/packages/wasi/src/wasienv.pas
+++ b/packages/wasi/src/wasienv.pas
@@ -2291,7 +2291,7 @@ var
   SrcBytes,tmpBytes : TJSUint8Array;
 
 begin
-  if isDefined(Self_['TJSSharedArrayBuffer']) and (getModuleMemoryDataView.bufferObj is TJSSharedArrayBuffer) then
+  if isDefined(Self_['SharedArrayBuffer']) and (getModuleMemoryDataView.bufferObj is TJSSharedArrayBuffer) then
     begin
     src:=getModuleMemoryDataView.buffer.slice(aLoc,aLoc+alen);
     SrcBytes:=TJSUint8Array.new(src);