diff --git a/os/writeterm.c b/os/writeterm.c
index 337b3317e..fdb00df6d 100644
--- a/os/writeterm.c
+++ b/os/writeterm.c
@@ -678,7 +678,7 @@ writeln ( USES_REGS1 )
   args[WRITE_NL].tvalue = TermTrue;
   args[WRITE_NUMBERVARS].used = true;
   args[WRITE_NUMBERVARS].tvalue = TermTrue;
-  write_term( output_stream, ARG1, args PASS_REGS);
+  write_term( output_stream, ARG2, args PASS_REGS);
   UNLOCK(GLOBAL_Stream[output_stream].streamlock);
   Yap_CloseSlots( mySlots );
   if (EX != 0L) {