diff --git a/Formula/ffmpeg.rb b/Formula/ffmpeg.rb
index 9a87196940..d0c7006939 100644
--- a/Formula/ffmpeg.rb
+++ b/Formula/ffmpeg.rb
@@ -24,6 +24,7 @@ class Ffmpeg < Formula
   depends_on 'x264' => :optional
   depends_on 'faac' => :optional
   depends_on 'lame' => :optional
+  depends_on 'rtmpdump' => :optional
   depends_on 'theora' => :optional
   depends_on 'libvorbis' => :optional
   depends_on 'libogg' => :optional
@@ -46,6 +47,7 @@ class Ffmpeg < Formula
     args << "--enable-libx264" if Formula.factory('x264').installed?
     args << "--enable-libfaac" if Formula.factory('faac').installed?
     args << "--enable-libmp3lame" if Formula.factory('lame').installed?
+    args << "--enable-librtmp" if Formula.factory('rtmpdump').installed?
     args << "--enable-libtheora" if Formula.factory('theora').installed?
     args << "--enable-libvorbis" if Formula.factory('libvorbis').installed?
     args << "--enable-libvpx" if Formula.factory('libvpx').installed?