diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index befc0cf5643..2cb6c2709cc 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -77,6 +77,7 @@
 (declare-function treesit-node-child "treesit.c")
 (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")
 
 ;;; Custom variables