diff --git a/lib/src/utils/commands_extension.dart b/lib/src/utils/commands_extension.dart
index 2f6d2fc5..132be15f 100644
--- a/lib/src/utils/commands_extension.dart
+++ b/lib/src/utils/commands_extension.dart
@@ -156,6 +156,25 @@ extension CommandsClientExtension on Client {
       if (inReplyTo == null) {
         return null;
       }
+      final match = RegExp(r':(?:([-\w]+)~)?([-\w]+):').firstMatch(args.msg);
+      if (match != null) {
+        final emotePacks = args.room.getImagePacksFlat(ImagePackUsage.emoticon);
+        final pack = match[1];
+        final emote = match[2];
+        String? mxc;
+        if (pack != null) {
+          mxc = emotePacks[pack]?[emote];
+        } else {
+          for (final emotePack in emotePacks.values) {
+            mxc = emotePack[emote];
+            break;
+          }
+        }
+        if (mxc != null) {
+          args.msg = mxc;
+        }
+      }
+
       return await args.room.sendReaction(inReplyTo.eventId, args.msg);
     });
     addCommand('join', (CommandArgs args) async {
diff --git a/test/commands_test.dart b/test/commands_test.dart
index c78fa50d..e60b77f9 100644
--- a/test/commands_test.dart
+++ b/test/commands_test.dart
@@ -156,6 +156,45 @@ void main() {
       });
     });
 
+    test('react_custom_emote', () async {
+      FakeMatrixApi.calledEndpoints.clear();
+      room.setState(Event(
+        type: 'im.ponies.room_emotes',
+        content: {
+          'images': {
+            'room_plain': {'url': 'mxc://room_plain'}
+          }
+        },
+        room: room,
+        stateKey: '',
+        senderId: '@fakeuser:fakeServer.notExisting',
+        eventId: '\$fakeid5:fakeServer.notExisting',
+        originServerTs: DateTime.now(),
+      ));
+      await room.sendTextEvent('/react :room_plain:',
+          inReplyTo: Event(
+            eventId: '\$event',
+            type: 'm.room.message',
+            content: {
+              'msgtype': 'm.text',
+              'body': '<b>yay</b>',
+              'format': 'org.matrix.custom.html',
+              'formatted_body': '<b>yay</b>',
+            },
+            originServerTs: DateTime.now(),
+            senderId: client.userID!,
+            room: room,
+          ));
+      final sent = getLastMessagePayload('m.reaction');
+      expect(sent, {
+        'm.relates_to': {
+          'rel_type': 'm.annotation',
+          'event_id': '\$event',
+          'key': 'mxc://room_plain',
+        },
+      });
+    });
+
     test('thread', () async {
       FakeMatrixApi.calledEndpoints.clear();
       await room.sendTextEvent(