diff --git a/network/mail/thunderbird/pspec.xml b/network/mail/thunderbird/pspec.xml
index 11fa2a93cf..0f4434f84b 100644
--- a/network/mail/thunderbird/pspec.xml
+++ b/network/mail/thunderbird/pspec.xml
@@ -39,6 +39,7 @@
             <Dependency>hunspell-devel</Dependency>
             <Dependency>libevent-devel</Dependency>
             <Dependency>gconf-devel</Dependency>
+            <Dependency>libvpx-devel</Dependency>
             <Dependency>startup-notification-devel</Dependency>
         </BuildDependencies>
         <Patches>