diff --git a/packages/client/src/components/MkPostForm.vue b/packages/client/src/components/MkPostForm.vue
index c7b996912..754814aa0 100644
--- a/packages/client/src/components/MkPostForm.vue
+++ b/packages/client/src/components/MkPostForm.vue
@@ -1074,6 +1074,7 @@ async function post() {
 				}
 				posting.value = false;
 				postAccount.value = null;
+				nextTick(() => autosize.update(textareaEl.value));
 			});
 		})
 		.catch((err) => {