diff --git a/font-latex.el b/font-latex.el
index d7d26fab..7c88dff2 100644
--- a/font-latex.el
+++ b/font-latex.el
@@ -2076,6 +2076,9 @@ set to french, and >>german<< (and 8-bit) are used if set to german."
 			     (setq nest-count (1+ nest-count))
 			   (when (/= nest-count 0)
 			     (setq nest-count (1- nest-count)))))))
+	      (unless (and (> (point) point-of-surrender)
+			   (not (bobp)))
+		(throw 'extend nil))
 	      (when (< (point) font-lock-beg)
                 (setq font-lock-beg (point))
 		(throw 'extend t)))))))))