diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index a2ae3541..060b0d19 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -33,7 +33,7 @@ ANTLR:
   type: programming
   color: "#9DC3FF"
   lexer: ANTLR
-  primary_extension: .g
+  primary_extension: .g4
   
 ASP:
   type: programming