diff --git a/firefox.spec b/firefox.spec
index 6248af8..1f939b3 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -93,6 +93,7 @@ Patch100:       mozilla-722127.patch
 BuildRequires:  desktop-file-utils
 BuildRequires:  system-bookmarks
 BuildRequires:  gecko-devel%{?_isa} = %{gecko_verrel}
+BuildRequires:  libvpx-devel
 
 Requires:       gecko-libs%{?_isa} = %{gecko_verrel}
 Requires:       system-bookmarks