diff --git a/mail/base/skin/mac/messageHeader.css b/mail/base/skin/mac/messageHeader.css
index b42f3706fc0..0b55310d18b 100644
--- a/mail/base/skin/mac/messageHeader.css
+++ b/mail/base/skin/mac/messageHeader.css
@@ -87,8 +87,7 @@ description[selectable="true"]:focus > descriptionitem[selected="true"]
 
 .attachmentBox 
 {
-  width: 15em;
-  max-width: 10em;
+  min-width: 15em;
   text-align: left;
 }
 
diff --git a/mail/base/skin/messageHeader.css b/mail/base/skin/messageHeader.css
index 7a3f9862e3f..7e8df8d1db2 100644
--- a/mail/base/skin/messageHeader.css
+++ b/mail/base/skin/messageHeader.css
@@ -90,8 +90,7 @@ description[selectable="true"]:focus > descriptionitem[selected="true"]
 
 .attachmentBox 
 {
-  width: 15em;
-  max-width: 10em;
+  min-width: 15em;
   text-align: left;
 }