diff --git a/app/lib/babycode.py b/app/lib/babycode.py
index 206c3d6..5623b3e 100644
--- a/app/lib/babycode.py
+++ b/app/lib/babycode.py
@@ -8,7 +8,7 @@ def tag_code(children, attr):
         return f"<code class=\"inline-code\">{children}</code>"
     else:
         t = children.strip()
-        button = f"<button type=button class=\"copy-code\" value={t}>Copy</button>"
+        button = f"<button type=button class=\"copy-code\" value=\"{t}\">Copy</button>"
         return f"<pre><span class=\"copy-code-container\">{button}</span><code>{t}</code></pre>"
 
 def tag_list(children):