diff --git a/ts/session/disappearing_messages/index.ts b/ts/session/disappearing_messages/index.ts
index e123a63fe..dc90c3912 100644
--- a/ts/session/disappearing_messages/index.ts
+++ b/ts/session/disappearing_messages/index.ts
@@ -13,6 +13,7 @@ import { getConversationController } from '../conversations';
 import { isValidUnixTimestamp } from '../utils/Timestamps';
 import {
   checkIsLegacyDisappearingDataMessage,
+  checkShouldDisappearButIsntMessage,
   couldBeLegacyDisappearingMessageContent,
 } from './legacy';
 import {
@@ -229,7 +230,7 @@ export function changeToDisappearingMessageType(
   expirationMode?: DisappearingMessageConversationModeType
 ): DisappearingMessageType {
   if (expirationMode === 'off' || expirationMode === 'legacy') {
-    // NOTE we would want this to be undefined but because of an issue with the protobuf implement we need to have a value
+    // NOTE we would want this to be undefined but because of an issue with the protobuf implementation we need to have a value
     return 'unknown';
   }
 
@@ -271,26 +272,6 @@ export function changeToDisappearingConversationMode(
   return expirationType === 'deleteAfterSend' ? 'deleteAfterSend' : 'deleteAfterRead';
 }
 
-/**
- * Checks if a message is meant to disappear but doesn't have the correct expiration values set
- *
- * NOTE Examples: legacy disappearing message conversation settings, synced messages from legacy devices
- */
-function checkDisappearButIsntMessage(
-  content: SignalService.Content,
-  convo: ConversationModel,
-  expirationMode: DisappearingMessageConversationModeType,
-  expirationTimer: number
-): boolean {
-  return (
-    content.dataMessage?.flags !== SignalService.DataMessage.Flags.EXPIRATION_TIMER_UPDATE &&
-    expirationMode === 'off' &&
-    expirationTimer === 0 &&
-    convo.getExpirationMode() !== 'off' &&
-    convo.getExpireTimer() !== 0
-  );
-}
-
 // TODO legacy messages support will be removed in a future release
 export async function checkForExpireUpdateInContentMessage(
   content: SignalService.Content,
@@ -360,7 +341,7 @@ export async function checkForExpireUpdateInContentMessage(
     };
   }
 
-  const shouldDisappearButIsntMessage = checkDisappearButIsntMessage(
+  const shouldDisappearButIsntMessage = checkShouldDisappearButIsntMessage(
     content,
     convoToUpdate,
     expirationMode,
diff --git a/ts/session/disappearing_messages/legacy.ts b/ts/session/disappearing_messages/legacy.ts
index 316cd73bf..d72382601 100644
--- a/ts/session/disappearing_messages/legacy.ts
+++ b/ts/session/disappearing_messages/legacy.ts
@@ -1,8 +1,9 @@
+// TODO legacy messages support will be removed in a future release
+import { ConversationModel } from '../../models/conversation';
 import { ProtobufUtils, SignalService } from '../../protobuf';
 import { ReleasedFeatures } from '../../util/releaseFeature';
 import { DisappearingMessageConversationModeType } from './types';
 
-// TODO legacy messages support will be removed in a future release
 export function isLegacyDisappearingModeEnabled(
   expirationMode: DisappearingMessageConversationModeType | undefined
 ): boolean {
@@ -24,8 +25,7 @@ export function checkIsLegacyDisappearingDataMessage(
   );
 }
 
-// TODO legacy messages support will be removed in a future release
-// NOTE We need this to check for legacy disappearing messages where the expirationType and expireTimer should be undefined on the ContentMessage
+/** Use this to check for legacy disappearing messages where the expirationType and expireTimer should be undefined on the ContentMessage */
 export function couldBeLegacyDisappearingMessageContent(
   contentMessage: SignalService.Content
 ): boolean {
@@ -36,3 +36,25 @@ export function couldBeLegacyDisappearingMessageContent(
     !ProtobufUtils.hasDefinedProperty(contentMessage, 'expirationTimer')
   );
 }
+
+/**
+ * Checks if a message is meant to disappear but doesn't have the correct expiration values set.
+ *
+ * Hopefully we can remove this when we remove legacy support but will need thorough testing
+ *
+ * NOTE Examples: legacy disappearing message conversation settings, synced messages from legacy devices
+ */
+export function checkShouldDisappearButIsntMessage(
+  content: SignalService.Content,
+  convo: ConversationModel,
+  expirationMode: DisappearingMessageConversationModeType,
+  expirationTimer: number
+): boolean {
+  return (
+    content.dataMessage?.flags !== SignalService.DataMessage.Flags.EXPIRATION_TIMER_UPDATE &&
+    expirationMode === 'off' &&
+    expirationTimer === 0 &&
+    convo.getExpirationMode() !== 'off' &&
+    convo.getExpireTimer() !== 0
+  );
+}