diff --git a/lmdeploy/vl/model/xcomposer2.py b/lmdeploy/vl/model/xcomposer2.py
index b93c784c8..188c8e9b1 100644
--- a/lmdeploy/vl/model/xcomposer2.py
+++ b/lmdeploy/vl/model/xcomposer2.py
@@ -304,8 +304,8 @@ def proc_messages(messages, chat_template, sequence_start, model_type):
                     if n_images == 1:
                         prefix_image_token, prompt = IMAGE_TOKEN, content[0]
                     else:
-                        prompt = '; '.join([
-                            f'Image{i+1} {IMAGE_TOKEN}'
+                        prompt = ''.join([
+                            f'Image{i+1} {IMAGE_TOKEN}; '
                             for i in range(n_images)
                         ]) + content[0]
                 else: