diff --git a/packages/webidl/src/webidlparser.pp b/packages/webidl/src/webidlparser.pp
index c1bf5b4d7b..e0bbf12e06 100644
--- a/packages/webidl/src/webidlparser.pp
+++ b/packages/webidl/src/webidlparser.pp
@@ -1371,7 +1371,7 @@ begin
         ExpectToken(tkunsigned);
         ExpectToken(tklong);
         Result:=TIDLTypeDefDefinition(AddDefinition(aParent,TIDLTypeDefDefinition,''));
-        Result.TypeName:='unsinged long';
+        Result.TypeName:='unsigned long';
         Result.Attributes.Add(EnforceRange);
         end;
       LegacyDOMString: