diff --git a/tests/webtbs/tw12985.pp b/tests/webtbs/tw12985.pp
index 3098acf621..36222cbbeb 100644
--- a/tests/webtbs/tw12985.pp
+++ b/tests/webtbs/tw12985.pp
@@ -5,11 +5,11 @@
   convention mismatch when parsing the actual definition
 }
 
-{$calling register}
+{$calling cdecl}
 function test(l1,l2: longint): longint; forward;
 {$calling stdcall}
 
-function test(l1,l2: longint): longint; register;
+function test(l1,l2: longint): longint; cdecl;
 begin
 end;