diff --git a/arch/sim/include/irq.h b/arch/sim/include/irq.h
index 4c712a21b7..1b2d31b024 100644
--- a/arch/sim/include/irq.h
+++ b/arch/sim/include/irq.h
@@ -138,9 +138,8 @@ static inline_function void up_set_current_regs(xcpt_reg_t *regs)
 static inline uintptr_t up_getsp(void)
 {
 #ifdef _MSC_VER
-  uintptr_t regval;
-  __asm mov regval, esp;
-  return regval;
+  uintptr_t tmp;
+  return (uintptr_t)&tmp;
 #else
   return (uintptr_t)__builtin_frame_address(0);
 #endif