diff --git a/homeassistant/components/mastodon/services.yaml b/homeassistant/components/mastodon/services.yaml
index dd153fd7c02..1c0dfa7e836 100644
--- a/homeassistant/components/mastodon/services.yaml
+++ b/homeassistant/components/mastodon/services.yaml
@@ -9,6 +9,7 @@ post:
       required: true
       selector:
         text:
+          multiline: true
     visibility:
       selector:
         select:
diff --git a/tests/components/mastodon/test_services.py b/tests/components/mastodon/test_services.py
index 239084e9786..01f3bf8c96e 100644
--- a/tests/components/mastodon/test_services.py
+++ b/tests/components/mastodon/test_services.py
@@ -118,9 +118,12 @@ from tests.common import MockConfigEntry
             },
         ),
         (
-            {ATTR_STATUS: "test toot", ATTR_IDEMPOTENCY_KEY: "post_once_only"},
             {
-                "status": "test toot",
+                ATTR_STATUS: "test toot\nwith idempotency",
+                ATTR_IDEMPOTENCY_KEY: "post_once_only",
+            },
+            {
+                "status": "test toot\nwith idempotency",
                 "idempotency_key": "post_once_only",
                 "language": None,
                 "spoiler_text": None,