diff --git a/app/logical/sources/strategies/base.rb b/app/logical/sources/strategies/base.rb
index 48a9ca98e..bc0e1624a 100644
--- a/app/logical/sources/strategies/base.rb
+++ b/app/logical/sources/strategies/base.rb
@@ -83,7 +83,7 @@ module Sources
       end
 
       def tags
-        @tags || []
+        @tags.uniq || []
       end
 
       # Should be set to a url for sites that prevent hotlinking, or left nil for sites that don't.