diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 7afedf3f..014e0201 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -71,8 +71,6 @@ Ada:
 Agda:
   type: programming
   primary_extension: .agda
-  extensions:
-    - .agda
 
 ApacheConf:
   type: markup