diff --git a/packages/web-api/src/types/request/slackLists.ts b/packages/web-api/src/types/request/slackLists.ts
index 21cc8d431..ee59cde43 100644
--- a/packages/web-api/src/types/request/slackLists.ts
+++ b/packages/web-api/src/types/request/slackLists.ts
@@ -57,12 +57,20 @@ export interface SlackListsItemFieldLink {
   }>;
 }
 
+export interface SlackListsItemMessage {
+  text?: string;
+  ts?: string;
+  user?: string;
+  team?: string;
+  type?: string;
+}
+
 /**
- * @description Message field with message URLs.
+ * @description Message field with one or more message objects.
  */
 export interface SlackListsItemFieldMessage {
   column_id: string;
-  message: string[];
+  message: SlackListsItemMessage | SlackListsItemMessage[];
 }
 
 /**
diff --git a/packages/web-api/test/types/methods/slacklists-response.test-d.ts b/packages/web-api/test/types/methods/slacklists-response.test-d.ts
new file mode 100644
index 000000000..5538f166c
--- /dev/null
+++ b/packages/web-api/test/types/methods/slacklists-response.test-d.ts
@@ -0,0 +1,26 @@
+import { expectAssignable } from 'tsd';
+import type { SlackListsItemFieldMessage } from '../../../src/types/request/slackLists';
+
+expectAssignable<SlackListsItemFieldMessage>({
+  column_id: 'Col123',
+  message: {
+    text: 'hello',
+    ts: '123.456',
+    user: 'U123',
+    team: 'T123',
+    type: 'message',
+  },
+});
+
+expectAssignable<SlackListsItemFieldMessage>({
+  column_id: 'Col123',
+  message: [
+    {
+      text: 'hello',
+      ts: '1234567890.123456',
+      user: 'U123',
+      team: 'T123',
+      type: 'message',
+    },
+  ],
+});