diff --git a/pkgs/tools/cd-dvd/cdrdao/default.nix b/pkgs/tools/cd-dvd/cdrdao/default.nix
index caf37ccbe1d..95dd58a59b4 100644
--- a/pkgs/tools/cd-dvd/cdrdao/default.nix
+++ b/pkgs/tools/cd-dvd/cdrdao/default.nix
@@ -24,6 +24,9 @@ stdenv.mkDerivation {
     sed -i 's,linux/../,,g' dao/sg_err.h
   '';
 
+  # Needed on gcc >= 6.
+  NIX_CFLAGS_COMPILE = "-Wno-narrowing";
+
   meta = {
     description = "A tool for recording audio or data CD-Rs in disk-at-once (DAO) mode";
     homepage = http://cdrdao.sourceforge.net/;