diff --git a/packages/utils.py b/packages/utils.py
index 82313472..b86b6eba 100644
--- a/packages/utils.py
+++ b/packages/utils.py
@@ -123,7 +123,7 @@ def get_differences_info(arch_a, arch_b):
     cursor.execute(sql, [arch_a.id, arch_b.id])
     results = cursor.fetchall()
     # column A will always have a value, column B might be NULL
-    to_fetch = [row[0] for row in results]
+    to_fetch = set(row[0] for row in results)
     # fetch all of the necessary packages
     pkgs = Package.objects.normal().in_bulk(to_fetch)
     # now build a list of tuples containing differences