diff --git a/pandoc_tex_numbering.py b/pandoc_tex_numbering.py
index 35e2656..d1e941b 100644
--- a/pandoc_tex_numbering.py
+++ b/pandoc_tex_numbering.py
@@ -399,7 +399,7 @@ def add_label_to_caption(num_obj, label: str, elem):
         has_caption = False
     if has_caption:
         # If there's no caption text, we shouldnot add a colon
-        label_items.extend([Str(":"), Space()])
+        label_items.extend([Space(), ])
     for item in label_items[::-1]:
         elem.caption.content[0].content.insert(0, item)