diff --git a/beetsplug/lastgenre/__init__.py b/beetsplug/lastgenre/__init__.py
index 950d0c71b..eba6c6cab 100644
--- a/beetsplug/lastgenre/__init__.py
+++ b/beetsplug/lastgenre/__init__.py
@@ -41,6 +41,13 @@ PYLAST_EXCEPTIONS = (
 )
 
 
+def deduplicate(seq):
+    """Remove duplicates from sequence wile preserving order.
+    """
+    seen = set()
+    return [x for x in seq if x not in seen and not seen.add(x)]
+
+
 # Core genre identification routine.
 
 def _tags_for(obj, min_weight=None):
@@ -198,13 +205,7 @@ class LastGenrePlugin(plugins.BeetsPlugin):
                     break
             tags = tags_all
 
-        def remove_duplicates(seq):
-            """Remove duplicates from sequence wile preserving order"""
-            seen = set()
-            seen_add = seen.add
-            return [x for x in seq if x not in seen and not seen_add(x)]
-
-        tags = remove_duplicates(tags)
+        tags = deduplicate(tags)
 
         # c14n only adds allowed genres but we may have had forbidden genres in
         # the original tags list
diff --git a/docs/changelog.rst b/docs/changelog.rst
index fe227700a..fceededc0 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -50,7 +50,9 @@ Little improvements and fixes:
 * :doc:`/plugins/fetchart`: When loading art from the filesystem, we now
   prioritize covers with more keywords in them. This means that
   ``cover-front.jpg`` will now be taken before ``cover-back.jpg`` because it
-  contains two keywords rather than one.
+  contains two keywords rather than one. Thanks to Fabrice Laporte.
+* :doc:`/plugins/lastgenre`: Remove duplicates from canonicalized genre lists.
+  Thanks again to Fabrice Laporte.
 
 
 1.3.6 (May 10, 2014)