diff --git a/public/404.html b/public/404.html
index 400bc0108..a1d7e970f 100644
--- a/public/404.html
+++ b/public/404.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" />
   <title>Redmine 404 error</title>
   <style>
-    body {font-family: Trebuchet MS, Georgia, "Times New Roman", serif; color: #303030; margin: 10px;}
+    body {font-family: "Trebuchet MS", Georgia, "Times New Roman", serif; color: #303030; margin: 10px;}
     h1 {font-size:1.5em;}
     p {font-size:0.8em;}
   </style>
diff --git a/public/500.html b/public/500.html
index 4afdbda68..254e20df2 100644
--- a/public/500.html
+++ b/public/500.html
@@ -4,7 +4,7 @@
   <meta charset="utf-8" />
   <title>Redmine 500 error</title>
   <style>
-    body {font-family: Trebuchet MS, Georgia, "Times New Roman", serif; color: #303030; margin: 10px;}
+    body {font-family: "Trebuchet MS", Georgia, "Times New Roman", serif; color: #303030; margin: 10px;}
     h1 {font-size:1.5em;}
     p {font-size:0.8em;}
   </style>