diff --git a/lisp/progmodes/c-ts-common.el b/lisp/progmodes/c-ts-common.el
index 6767f10a9e7..0b0a7ff7cd3 100644
--- a/lisp/progmodes/c-ts-common.el
+++ b/lisp/progmodes/c-ts-common.el
@@ -51,6 +51,7 @@
 (declare-function treesit-node-end "treesit.c")
 (declare-function treesit-node-type "treesit.c")
 (declare-function treesit-node-parent "treesit.c")
+(declare-function treesit-node-prev-sibling "treesit.c")
 
 ;;; Comment indentation and filling