diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 6a359107..601ad57b 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1169,10 +1169,8 @@ Perl6:
   - .p6m
   - .pl
   - .pl6
-  - .pl6
   - .pm
   - .pm6
-  - .pm6
 
 Pike:
   type: programming