diff --git a/lisp/progmodes/c-ts-mode.el b/lisp/progmodes/c-ts-mode.el
index c815ee35501..9bbb78e0862 100644
--- a/lisp/progmodes/c-ts-mode.el
+++ b/lisp/progmodes/c-ts-mode.el
@@ -973,9 +973,14 @@ Return nil if NODE is not a defun node or doesn't have a name."
 
 (defun c-ts-mode--outline-predicate (node)
   "Match outlines on lines with function names."
-  (or (and (equal (treesit-node-type node) "function_declarator")
-           (equal (treesit-node-type (treesit-node-parent node))
-                  "function_definition"))
+  (or (when-let* ((decl (treesit-node-child-by-field-name
+                         (treesit-node-parent node) "declarator"))
+                  (node-pos (treesit-node-start node))
+                  (decl-pos (treesit-node-start decl))
+                  (eol (save-excursion (goto-char node-pos) (line-end-position))))
+        (and (equal (treesit-node-type decl) "function_declarator")
+             (<= node-pos decl-pos)
+             (< decl-pos eol)))
       ;; DEFUNs in Emacs sources.
       (and c-ts-mode-emacs-sources-support
            (c-ts-mode--emacs-defun-p node))))