diff --git a/init.el b/init.el
index 49db404..f42511e 100644
--- a/init.el
+++ b/init.el
@@ -1097,6 +1097,11 @@ otherwise, call `bibtex-find-text'."
   "Set up `bibtex-mode' indentation stuff."
   (setq-local indent-line-function 'my/bibtex-indent-line
               electric-indent-chars '(?\n ?\{ ?\} ?,)))
+(defun my/-bibtex-fix-fill-prefix ()
+  "`bivtex-mode' has a bad habbit of messing up `fill-prefix'."
+  (when (eq major-mode 'bibtex-mode)
+    (setq-local fill-prefix nil)))
+(advice-add 'bibtex-mode :after 'my/-bibtex-fix-fill-prefix)
 (add-hook 'bibtex-mode-hook 'my/-bibtex-setup-indent)
 (define-key bibtex-mode-map (kbd "RET") 'newline-and-indent)
 (define-key bibtex-mode-map (kbd "TAB") 'my/bibtex-indent-or-find-text)