diff --git a/lib/linguist/generated.rb b/lib/linguist/generated.rb
index 974fc7ae..99863a91 100644
--- a/lib/linguist/generated.rb
+++ b/lib/linguist/generated.rb
@@ -235,7 +235,7 @@ module Linguist
     #
     # Returns true or false.
     def composer_lock?
-      !!name.match(/composer.lock/)
+      !!name.match(/composer\.lock/)
     end
 
     # Internal: Is the blob a generated by Zephir