diff --git a/shmup.cpp b/shmup.cpp
index bbce9723..de4ebde6 100644
--- a/shmup.cpp
+++ b/shmup.cpp
@@ -238,7 +238,7 @@ bool isMonster(monster *m) { return m->type != moPlayer && m->type != moBullet;
 
 EX hookset<bool(shmup::monster*)> *hooks_kill;
 
-void killMonster(monster* m, eMonster who_kills, int flags = 0) {
+void killMonster(monster* m, eMonster who_kills, flagtype flags = 0) {
   int tk = tkills();
   if(callhandlers(false, hooks_kill, m)) return;
   if(m->dead) return;