diff --git a/pkgs/applications/radio/welle-io/default.nix b/pkgs/applications/radio/welle-io/default.nix
index 5a4ce6a9bca1..6f3e82e93022 100644
--- a/pkgs/applications/radio/welle-io/default.nix
+++ b/pkgs/applications/radio/welle-io/default.nix
@@ -17,6 +17,8 @@
   fftwSinglePrec,
   lame,
   mpg123,
+  withFlac ? true,
+  flac,
 }:
 
 stdenv.mkDerivation rec {
@@ -48,12 +50,12 @@ stdenv.mkDerivation rec {
     qt5compat
     rtl-sdr
     soapysdr-with-plugins
-  ];
+  ] ++ lib.optional withFlac flac;
 
   cmakeFlags = [
     "-DRTLSDR=true"
     "-DSOAPYSDR=true"
-  ];
+  ] ++ lib.optional withFlac "-DFLAC=true";
 
   meta = {
     description = "DAB/DAB+ Software Radio";