diff --git a/bot.py b/bot.py
index 1cabc25..ce31cd7 100644
--- a/bot.py
+++ b/bot.py
@@ -22,11 +22,11 @@ async def on_message(message):
     if message.author == bot.user:
         return
 
-    # Check if the message contains "nixos" (case-insensitive, as a whole word)
+    # Check if the message contains "nixos" (case-insensitive, as a whole word, not in a URL)
     if re.search(r'\bnixos\b', message.content, re.IGNORECASE):
-        # Replace "nixos" with "fagOS" (preserving case of the first letter)
+        # Replace "nixos" with "fagOS" (preserving case of the first letter), but exclude URLs
         new_content = re.sub(
-            r'\b(nixos)\b',
+            r'(?<!https?://\S*)\b(nixos)\b(?!\S*\/)',
             lambda m: 'FagOS' if m.group(1)[0].isupper() else 'fagOS',
             message.content,
             flags=re.IGNORECASE