diff --git a/pkgs/development/libraries/libfaketime/default.nix b/pkgs/development/libraries/libfaketime/default.nix
index 7d430614257..49710339828 100644
--- a/pkgs/development/libraries/libfaketime/default.nix
+++ b/pkgs/development/libraries/libfaketime/default.nix
@@ -12,6 +12,9 @@ stdenv.mkDerivation rec {
     makeFlagsArray+=(PREFIX="$out" LIBDIRNAME=/lib)
   '';
 
+  # Work around "libfaketime.c:513:7: error: nonnull argument 'buf' compared to NULL [-Werror=nonnull-compare]".
+  NIX_CFLAGS_COMPILE = "-Wno-nonnull-compare";
+
   meta = with stdenv.lib; {
     description = "Report faked system time to programs without having to change the system-wide time";
     homepage = http://www.code-wizards.com/projects/libfaketime/;