diff --git a/src/routes/_components/compose/ComposeInput.html b/src/routes/_components/compose/ComposeInput.html
index ca08ca98..f99f204e 100644
--- a/src/routes/_components/compose/ComposeInput.html
+++ b/src/routes/_components/compose/ComposeInput.html
@@ -68,12 +68,14 @@
   } from '../../_actions/autosuggest'
   import { observe } from 'svelte-extras'
   import { get } from '../../_utils/lodash-lite'
+  import { on } from '../../_utils/eventBus'
 
   export default {
     oncreate () {
       this.setupSyncFromStore()
       this.setupSyncToStore()
       this.setupAutosize()
+      this.setupResize()
     },
     ondestroy () {
       this.teardownAutosize()
@@ -225,6 +227,13 @@
         })
         event.preventDefault()
         event.stopPropagation()
+      },
+      setupResize () {
+        on('resizeComposeInput', this, realm => {
+          if (realm === this.get().realm) {
+            autosize.update(this.refs.textarea)
+          }
+        })
       }
     },
     store: () => store,
diff --git a/src/routes/_components/dialog/components/ComposeDialog.html b/src/routes/_components/dialog/components/ComposeDialog.html
index be98e51e..3040cd82 100644
--- a/src/routes/_components/dialog/components/ComposeDialog.html
+++ b/src/routes/_components/dialog/components/ComposeDialog.html
@@ -3,13 +3,14 @@
   {label}
   {title}
   background="var(--main-bg)"
+  on:show="onShow()"
 >
-  <ComposeBox realm="dialog" autoFocus={true} dialogId={id} />
+  <ComposeBox {realm} autoFocus={true} dialogId={id} />
 </ModalDialog>
 <script>
   import ModalDialog from './ModalDialog.html'
   import ComposeBox from '../../compose/ComposeBox.html'
-  import { on } from '../../../_utils/eventBus'
+  import { on, emit } from '../../../_utils/eventBus'
   import { show } from '../helpers/showDialog'
   import { oncreate as onCreateDialog } from '../helpers/onCreateDialog'
   import { close } from '../helpers/closeDialog'
@@ -20,16 +21,20 @@
       onCreateDialog.call(this)
     },
     data: () => ({
-      title: void 0
+      title: void 0,
+      realm: 'dialog'
     }),
     methods: {
       show,
       close,
       onPostedStatus (realm) {
-        if (realm !== 'dialog') {
+        if (realm !== this.get().realm) {
           return
         }
         this.close()
+      },
+      onShow () {
+        emit('resizeComposeInput', this.get().realm)
       }
     },
     components: {