diff --git a/pkgs/os-specific/linux/ffado/default.nix b/pkgs/os-specific/linux/ffado/default.nix
index 3755bbe80bbdac..a78599c6a20f8f 100644
--- a/pkgs/os-specific/linux/ffado/default.nix
+++ b/pkgs/os-specific/linux/ffado/default.nix
@@ -26,6 +26,8 @@ stdenv.mkDerivation rec {
     scons PREFIX=$out LIBDIR=$out/lib SHAREDIR=$out/share/libffado \
       PYPKGDIR=$out/$PYLIBSUFFIX install
 
+    sed -e "s#/usr/local#$out#g" -i $out/bin/ffado-diag
+
     PYDIR=$out/$PYLIBSUFFIX
     wrapProgram $out/bin/ffado-mixer --prefix PYTHONPATH : \
       $PYTHONPATH:$PYDIR:${pyqt4}/$LIBSUFFIX:${pythonDBus}/$LIBSUFFIX: