diff --git a/lisp/progmodes/php-ts-mode.el b/lisp/progmodes/php-ts-mode.el
index 8bb18dab3d5..1c76e55c1d6 100644
--- a/lisp/progmodes/php-ts-mode.el
+++ b/lisp/progmodes/php-ts-mode.el
@@ -82,7 +82,7 @@
 
 ;;; Install treesitter language parsers
 (defvar php-ts-mode--language-source-alist
-  '((php . ("https://github.com/tree-sitter/tree-sitter-php" "v0.22.5"))
+  '((php . ("https://github.com/tree-sitter/tree-sitter-php" "v0.22.5" "php/src"))
     (phpdoc . ("https://github.com/claytonrcarter/tree-sitter-phpdoc"))
     (html . ("https://github.com/tree-sitter/tree-sitter-html"  "v0.20.3"))
     (javascript . ("https://github.com/tree-sitter/tree-sitter-javascript" "v0.21.2"))