diff --git a/compiler/ncnv.pas b/compiler/ncnv.pas
index 47fb5aafc4..1a66010213 100644
--- a/compiler/ncnv.pas
+++ b/compiler/ncnv.pas
@@ -2601,6 +2601,7 @@ implementation
               { may change the type conversion, e.g. if the old conversion was
                 from 64 bit to a 64 bit, and now becomes 64 bit to 32 bit }
               n.resultdef:=nil;
+              ttypeconvnode(n).convtype:=tc_none;
               typecheckpass(n);
             end;
           else