diff --git a/packages/fcl-hash/src/fphashutils.pp b/packages/fcl-hash/src/fphashutils.pp
index 7457a86190..2e44b4334b 100644
--- a/packages/fcl-hash/src/fphashutils.pp
+++ b/packages/fcl-hash/src/fphashutils.pp
@@ -236,6 +236,7 @@ end;
 
 function StringToHex(const s: ansistring): ansistring;
 begin
+  Result:='';
   if s='' then exit;
   BytesToHexStr(Result,@s[1],length(s));
 end;