diff --git a/firefox.spec b/firefox.spec
index 7dadbf1..18ae213 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -270,6 +270,7 @@ BuildRequires:  pkgconfig(libstartup-notification-1.0)
 BuildRequires:  pkgconfig(libnotify) >= %{libnotify_version}
 BuildRequires:  pkgconfig(dri)
 BuildRequires:  pkgconfig(libcurl)
+BuildRequires:  pkgconfig(alsa)
 BuildRequires:  dbus-glib-devel
 %if %{?system_libvpx}
 BuildRequires:  libvpx-devel >= %{libvpx_version}