diff --git a/src/phases/encounter-phase.ts b/src/phases/encounter-phase.ts
index af46d41ed24..a3f12510a34 100644
--- a/src/phases/encounter-phase.ts
+++ b/src/phases/encounter-phase.ts
@@ -47,7 +47,8 @@ import { WEIGHT_INCREMENT_ON_SPAWN_MISS } from "#app/data/mystery-encounters/mys
 import { getNatureName } from "#app/data/nature";
 
 export class EncounterPhase extends BattlePhase {
-  protected readonly phaseName = "EncounterPhase";
+  // Union type is necessary as these
+  protected readonly phaseName: "EncounterPhase" | "NextEncounterPhase" | "NewBiomeEncounterPhase" = "EncounterPhase";
   private loaded: boolean;
 
   constructor(loaded = false) {
diff --git a/src/phases/modifier-reward-phase.ts b/src/phases/modifier-reward-phase.ts
index 5a4f94dc154..f905496bb8c 100644
--- a/src/phases/modifier-reward-phase.ts
+++ b/src/phases/modifier-reward-phase.ts
@@ -7,7 +7,8 @@ import { BattlePhase } from "./battle-phase";
 export class ModifierRewardPhase extends BattlePhase {
   // RibbonModifierRewardPhase extends ModifierRewardPhase and to make typescript happy
   // we need to use a union type here
-  protected readonly phaseName: "ModifierRewardPhase" | "RibbonModifierRewardPhase" = "ModifierRewardPhase";
+  protected readonly phaseName: "ModifierRewardPhase" | "RibbonModifierRewardPhase" | "GameOverModifierRewardPhase" =
+    "ModifierRewardPhase";
   protected modifierType: ModifierType;
 
   constructor(modifierTypeFunc: ModifierTypeFunc) {
diff --git a/src/phases/next-encounter-phase.ts b/src/phases/next-encounter-phase.ts
index 6bf33a12608..4853904fdc4 100644
--- a/src/phases/next-encounter-phase.ts
+++ b/src/phases/next-encounter-phase.ts
@@ -6,7 +6,7 @@ import { EncounterPhase } from "./encounter-phase";
  * Handles generating, loading and preparing for it.
  */
 export class NextEncounterPhase extends EncounterPhase {
-  protected readonly phaseName = "NextEncounterPhase";
+  protected readonly phaseName: "NextEncounterPhase" | "NewBiomeEncounterPhase" = "NextEncounterPhase";
   start() {
     super.start();
   }
diff --git a/src/phases/summon-phase.ts b/src/phases/summon-phase.ts
index 81516d25929..f79d0c497a9 100644
--- a/src/phases/summon-phase.ts
+++ b/src/phases/summon-phase.ts
@@ -17,9 +17,9 @@ import { applyPreSummonAbAttrs, PreSummonAbAttr } from "#app/data/abilities/abil
 import { globalScene } from "#app/global-scene";
 
 export class SummonPhase extends PartyMemberPokemonPhase {
-  // Both SwitchSummonPhase and SummonMissingPhase extend this class and so we must use a
-  // union type to make typescript happy.
-  protected readonly phaseName: "SummonPhase" | "SummonMissingPhase" | "SwitchSummonPhase" = "SummonPhase";
+  // The union type is needed to keep typescript happy as these phases extend from SummonPhase
+  protected readonly phaseName: "SummonPhase" | "SummonMissingPhase" | "SwitchSummonPhase" | "ReturnPhase" =
+    "SummonPhase";
   private loaded: boolean;
 
   constructor(fieldIndex: number, player = true, loaded = false) {
diff --git a/src/phases/switch-summon-phase.ts b/src/phases/switch-summon-phase.ts
index 566698929b8..5119cb1ee2d 100644
--- a/src/phases/switch-summon-phase.ts
+++ b/src/phases/switch-summon-phase.ts
@@ -22,7 +22,7 @@ import { SubstituteTag } from "#app/data/battler-tags";
 import { SwitchType } from "#enums/switch-type";
 
 export class SwitchSummonPhase extends SummonPhase {
-  protected readonly phaseName = "SwitchSummonPhase";
+  protected readonly phaseName: "SwitchSummonPhase" | "ReturnPhase" = "SwitchSummonPhase";
   private readonly switchType: SwitchType;
   private readonly slotIndex: number;
   private readonly doReturn: boolean;