diff --git a/lightening/x86.c b/lightening/x86.c
index 965191a..91b3a94 100644
--- a/lightening/x86.c
+++ b/lightening/x86.c
@@ -338,11 +338,13 @@ next_abi_arg(struct abi_arg_iterator *iter, jit_operand_t *arg)
   if (is_gpr_arg(abi) && iter->gpr_idx < abi_gpr_arg_count) {
     *arg = jit_operand_gpr (abi, abi_gpr_args[iter->gpr_idx++]);
 #ifdef __CYGWIN__
+    iter->stack_size += 8;
     iter->fpr_idx++;
 #endif
   } else if (is_fpr_arg(abi) && iter->fpr_idx < abi_fpr_arg_count) {
     *arg = jit_operand_fpr (abi, abi_fpr_args[iter->fpr_idx++]);
 #ifdef __CYGWIN__
+    iter->stack_size += 8;
     iter->gpr_idx++;
 #endif
   } else {