diff --git a/pkgs/applications/misc/netsurf/libcss/default.nix b/pkgs/applications/misc/netsurf/libcss/default.nix
index 02bb593ce710..e97452249bcf 100644
--- a/pkgs/applications/misc/netsurf/libcss/default.nix
+++ b/pkgs/applications/misc/netsurf/libcss/default.nix
@@ -27,6 +27,8 @@ stdenv.mkDerivation rec {
     "NSSHARED=${buildsystem}/share/netsurf-buildsystem"
   ];
 
+  NIX_CFLAGS_COMPILE=[ "-Wno-error=implicit-fallthrough" ];
+
   meta = with stdenv.lib; {
     homepage = http://www.netsurf-browser.org/;
     description = "Cascading Style Sheets library for netsurf browser";