diff --git a/src/vm_x86.dasc b/src/vm_x86.dasc
index 9ea02ef7..1631097a 100644
--- a/src/vm_x86.dasc
+++ b/src/vm_x86.dasc
@@ -2022,7 +2022,7 @@ static void build_subroutines(BuildCtx *ctx)
   |  jmp ->vm_return
   |
   |.macro math_round, func
-  |  .ffunc math_ .. func
+  |  .ffunc_1 math_ .. func
   |.if DUALNUM
   |  cmp dword [BASE+4], LJ_TISNUM; jne >1
   |  mov RB, dword [BASE]; jmp ->fff_resi