diff --git a/src/web/app/desktop/views/components/post-form-window.vue b/src/web/app/desktop/views/components/post-form-window.vue
index dc16d7c9d..77b47e20a 100644
--- a/src/web/app/desktop/views/components/post-form-window.vue
+++ b/src/web/app/desktop/views/components/post-form-window.vue
@@ -10,7 +10,7 @@
 		<mk-post-preview v-if="reply" :class="$style.postPreview" :post="reply"/>
 		<mk-post-form ref="form"
 			:reply="reply"
-			@posted="$refs.window.close"
+			@posted="onPosted"
 			@change-uploadings="onChangeUploadings"
 			@change-attached-media="onChangeMedia"/>
 	</div>
@@ -39,6 +39,9 @@ export default Vue.extend({
 		},
 		onChangeMedia(media) {
 			this.media = media;
+		},
+		onPosted() {
+			(this.$refs.window as any).close();
 		}
 	}
 });
diff --git a/src/web/app/desktop/views/components/ui.vue b/src/web/app/desktop/views/components/ui.vue
index 39ec057f8..76851a0f1 100644
--- a/src/web/app/desktop/views/components/ui.vue
+++ b/src/web/app/desktop/views/components/ui.vue
@@ -21,7 +21,9 @@ export default Vue.extend({
 	},
 	methods: {
 		openPostForm() {
-			document.body.appendChild(new MkPostFormWindow().$mount().$el);
+			document.body.appendChild(new MkPostFormWindow({
+				parent: this
+			}).$mount().$el);
 		},
 		onKeydown(e) {
 			if (e.target.tagName == 'INPUT' || e.target.tagName == 'TEXTAREA') return;