diff --git a/src/cogs/auto_responder.py b/src/cogs/auto_responder.py
index b2a8510..885f1e3 100644
--- a/src/cogs/auto_responder.py
+++ b/src/cogs/auto_responder.py
@@ -261,7 +261,7 @@ class AutoResponder(commands.Cog):
         files = []
         self.log.info("Preparing to download: %s", ", ".join(map(ParseResult.geturl, links)))
         async with aiohttp.ClientSession() as session:
-            for link in links:
+            for link in set(links):
                 if link.path.endswith(".pdf"):
                     buffer = io.BytesIO()
                     self.log.info("Downloading %s", link)