diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index a6f0054b..5c6e147d 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1792,6 +1792,7 @@ Processing:
 
 Prolog:
   type: programming
+  lexer: Logtalk
   color: "#74283c"
   extensions:
   - .pl