diff --git a/lisp/progmodes/elixir-ts-mode.el b/lisp/progmodes/elixir-ts-mode.el
index d9b06a44e88..2ddce3de105 100644
--- a/lisp/progmodes/elixir-ts-mode.el
+++ b/lisp/progmodes/elixir-ts-mode.el
@@ -53,6 +53,7 @@
 (declare-function treesit-parser-language "treesit.c")
 (declare-function treesit-parser-included-ranges "treesit.c")
 (declare-function treesit-parser-list "treesit.c")
+(declare-function treesit-node-p "treesit.c")
 (declare-function treesit-node-parent "treesit.c")
 (declare-function treesit-node-start "treesit.c")
 (declare-function treesit-node-end "treesit.c")