diff --git a/lisp/treesit.el b/lisp/treesit.el
index 18a6131b71d..c37e7b6b5b7 100644
--- a/lisp/treesit.el
+++ b/lisp/treesit.el
@@ -1217,8 +1217,10 @@ See `treesit-simple-indent-presets'.")
 
                     (goto-char bol)
                     (setq this-line-has-prefix
-                          (and (looking-at adaptive-fill-regexp)
-                               (match-string 1)))
+                          (and (looking-at-p adaptive-fill-regexp)
+                               (not (string-match-p
+                                     (rx bos (* whitespace) eos)
+                                     (match-string 0)))))
 
                     (forward-line -1)
                     (and (>= (point) comment-start-bol)
@@ -1226,7 +1228,7 @@ See `treesit-simple-indent-presets'.")
                          (looking-at adaptive-fill-regexp)
                          ;; If previous line is an empty line, don't
                          ;; indent.
-                         (not (looking-at (rx (* whitespace) eol)))
+                         (not (looking-at-p (rx (* whitespace) eol)))
                          ;; Return the anchor.  If the indenting line
                          ;; has a prefix and the previous line also
                          ;; has a prefix, indent to the beginning of