diff --git a/src/battle_util.c b/src/battle_util.c
index 0f18efb9af..fce7c1eeb6 100644
--- a/src/battle_util.c
+++ b/src/battle_util.c
@@ -8746,6 +8746,7 @@ bool32 SetIllusionMon(struct Pokemon *mon, u32 battlerId)
         id = i;
         if (GetMonData(&party[id], MON_DATA_SANITY_HAS_SPECIES)
             && GetMonData(&party[id], MON_DATA_HP)
+            && !GetMonData(&party[id], MON_DATA_IS_EGG)
             && &party[id] != mon
             && &party[id] != partnerMon)
         {