diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index 87273ec91c0..be67e8db78f 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -1567,6 +1567,7 @@ recommended to enable `electric-pair-mode' with this mode."
                       (funcall c-ts-mode-indent-style)
                     (c-ts-mode--simple-indent-rules
                      'cpp c-ts-mode-indent-style)))
+      (setq-local editorconfig-indent-size-vars '(c-ts-indent-offset))
 
       ;; Font-lock.
       (setq-local treesit-font-lock-settings