diff --git a/attack.cpp b/attack.cpp
index b6c53509..e8f73a54 100644
--- a/attack.cpp
+++ b/attack.cpp
@@ -527,7 +527,7 @@ EX void killMonster(cell *c, eMonster who, flagtype deathflags IS(0)) {
           princess::reviveAt = gold(NO_LOVE) + 20;
           }
         }
-      if(princess::challenge) showMissionScreen();
+      if(princess::challenge) changes.at_commit([] { showMissionScreen(); });
       }
     }