diff --git a/mail/locales/en-US/chrome/messenger/preferences/security.dtd b/mail/locales/en-US/chrome/messenger/preferences/security.dtd
index 24503cc9e7..2739564881 100644
--- a/mail/locales/en-US/chrome/messenger/preferences/security.dtd
+++ b/mail/locales/en-US/chrome/messenger/preferences/security.dtd
@@ -5,7 +5,7 @@
 <!ENTITY itemJunk.label          "Junk">
 <!ENTITY itemPhishing.label      "E-mail Scams">
 <!ENTITY itemPasswords.label     "Passwords">
-<!ENTITY itemAntiVirus.label     "Anti-Virus">
+<!ENTITY itemAntiVirus.label     "Antivirus">
 
 <!-- Junk Mail Controls -->
 <!ENTITY junkMail.intro "Set your default junk mail settings. Account-specific junk mail settings can be configured in Account Settings.">
@@ -42,7 +42,7 @@
 <!ENTITY savedPasswords.accesskey       "S">
 
 <!-- Anti Virus -->
-<!ENTITY antiVirus.intro      "&brandShortName; can make it easy for anti-virus software to analyze incoming mail messages for viruses before they are stored locally.">
-<!ENTITY antiVirus.label      "Allow anti-virus clients to quarantine individual incoming messages">
+<!ENTITY antiVirus.intro      "&brandShortName; can make it easy for antivirus software to analyze incoming mail messages for viruses before they are stored locally.">
+<!ENTITY antiVirus.label      "Allow antivirus clients to quarantine individual incoming messages">
 <!ENTITY antiVirus.accesskey  "A">
 
diff --git a/suite/locales/en-US/chrome/common/help/mailnews_preferences.xhtml b/suite/locales/en-US/chrome/common/help/mailnews_preferences.xhtml
index 67d49ba340..68075506a8 100644
--- a/suite/locales/en-US/chrome/common/help/mailnews_preferences.xhtml
+++ b/suite/locales/en-US/chrome/common/help/mailnews_preferences.xhtml
@@ -577,9 +577,9 @@
     scam</strong>: Choose this to make &brandShortName; analyze messages for
     suspected email scams by looking for common techniques used to deceive
     people.</li>
-  <li><strong>Allow anti-virus clients to scan incoming messages more
+  <li><strong>Allow antivirus clients to scan incoming messages more
     easily</strong>: Choose this to let &brandShortName; make it easier for
-    anti-virus software to analyze incoming mail messages for viruses before
+    antivirus software to analyze incoming mail messages for viruses before
     they are stored locally.</li>
 </ul>
 
diff --git a/suite/locales/en-US/chrome/mailnews/pref/pref-junk.dtd b/suite/locales/en-US/chrome/mailnews/pref/pref-junk.dtd
index 4707378e01..c11959db39 100644
--- a/suite/locales/en-US/chrome/mailnews/pref/pref-junk.dtd
+++ b/suite/locales/en-US/chrome/mailnews/pref/pref-junk.dtd
@@ -35,6 +35,6 @@
 <!ENTITY enablePhishingDetector.accesskey "T">
 
 <!-- Anti Virus -->
-<!ENTITY pref.antivirus.caption           "Anti-Virus">
-<!ENTITY antiVirus.label                  "Allow anti-virus clients to scan incoming messages more easily">
+<!ENTITY pref.antivirus.caption           "Antivirus">
+<!ENTITY antiVirus.label                  "Allow antivirus clients to scan incoming messages more easily">
 <!ENTITY antiVirus.accesskey              "A">