diff --git a/packages/client/src/components/MkPostForm.vue b/packages/client/src/components/MkPostForm.vue
index 35c97db599..ec8480d6f6 100644
--- a/packages/client/src/components/MkPostForm.vue
+++ b/packages/client/src/components/MkPostForm.vue
@@ -1081,6 +1081,7 @@ async function post() {
 				}
 				posting.value = false;
 				postAccount.value = null;
+				nextTick(() => autosize.update(textareaEl.value));
 			});
 		})
 		.catch((err) => {