diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 259b96d342e..a29bf4f3480 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -78,6 +78,7 @@
 (declare-function treesit-node-child-by-field-name "treesit.c")
 (declare-function treesit-node-type "treesit.c")
 (declare-function treesit-node-prev-sibling "treesit.c")
+(declare-function treesit-node-first-child-for-pos "treesit.c")
 
 ;;; Custom variables