diff --git a/public/404.html b/public/404.html
index 23c08dd..5eac71d 100644
--- a/public/404.html
+++ b/public/404.html
@@ -4,7 +4,7 @@
 <title>Redmine 404 error</title>
 <style>
 body{
-font-family: Trebuchet MS,Georgia,"Times New Roman",serif;
+font-family: "Trebuchet MS",Georgia,"Times New Roman",serif;
 color:#303030;
 margin:10px;
 }
diff --git a/public/500.html b/public/500.html
index 588d83b..69a6dc9 100644
--- a/public/500.html
+++ b/public/500.html
@@ -4,7 +4,7 @@
 <title>Redmine 500 error</title>
 <style>
 body{
-font-family: Trebuchet MS,Georgia,"Times New Roman",serif;
+font-family: "Trebuchet MS",Georgia,"Times New Roman",serif;
 color:#303030;
 margin:10px;
 }