diff --git a/components/pas2js/components/pas2jsrestutils.pas b/components/pas2js/components/pas2jsrestutils.pas
index c2d40aeb49..c193d7283e 100644
--- a/components/pas2js/components/pas2jsrestutils.pas
+++ b/components/pas2js/components/pas2jsrestutils.pas
@@ -218,7 +218,7 @@ begin
     aFieldDefs.BeginUpdate;
     While not Buf.EOF do
       begin
-      if aFieldDefs.Find(aName.AsString)=nil then
+      if aFieldDefs.IndexOf(aName.AsString)=-1 then
         begin
         aFieldDefs.Add(aName.AsString,GetFieldType(aType.AsString),aMaxLen.asInteger,aRequired.AsBoolean);
         Inc(Result);