diff --git a/public/stylesheets/project.css b/public/stylesheets/project.css
index 11c01aa09..2ca1d56d8 100644
--- a/public/stylesheets/project.css
+++ b/public/stylesheets/project.css
@@ -694,7 +694,7 @@ p.other-formats { text-align: right; font-size:0.9em; color: #666; }
 
 /*pre标签换行*/
 .break_word{word-break: break-all;word-wrap: break-word;}
-.break_word_firefox{white-space: pre-wrap;word-break: break-all;}
+.break_word_firefox{white-space: pre-wrap !important;word-break: break-all;}
 
 /*问题跟踪attachment显示*/
 div.attachments { margin-top: 12px; }