diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 12003ff4727..73ec3f2bb2d 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -82,6 +82,7 @@
 (declare-function treesit-node-prev-sibling "treesit.c")
 (declare-function treesit-node-first-child-for-pos "treesit.c")
 (declare-function treesit-node-next-sibling "treesit.c")
+(declare-function treesit-node-eq "treesit.c")
 (declare-function treesit-query-compile "treesit.c")
 
 ;;; Custom variables