diff --git a/pkgs/applications/video/gnash/builder.sh b/pkgs/applications/video/gnash/builder.sh
index 41e0691c4803..b90cec984296 100644
--- a/pkgs/applications/video/gnash/builder.sh
+++ b/pkgs/applications/video/gnash/builder.sh
@@ -1,5 +1,5 @@
 source $stdenv/setup
 
-configureFlags="--with-sdl-mixer-incl=$SDL_mixer/include/SDL --with-sdl-incl=$SDL/include/SDL --with-plugindir=$out"
+configureFlags="--with-sdl-mixer-incl=$SDL_mixer/include/SDL --with-sdl-incl=$SDL/include/SDL --with-plugindir=$out/plugins"
 
 genericBuild
diff --git a/pkgs/applications/video/gnash/default.nix b/pkgs/applications/video/gnash/default.nix
index 8d8dfacc94ff..4ceb5726b7be 100644
--- a/pkgs/applications/video/gnash/default.nix
+++ b/pkgs/applications/video/gnash/default.nix
@@ -14,4 +14,4 @@ stdenv.mkDerivation {
   buildInputs = [libX11 libXext libXi libXmu SDL SDL_mixer GStreamer
                  libogg libxml2 libjpeg mesa libpng];
   inherit SDL_mixer SDL;
-}
+} // {mozillaPlugin = "/plugins";}