diff --git a/pkgs/applications/misc/osm2xmap/default.nix b/pkgs/applications/misc/osm2xmap/default.nix
index 5787adef2a3e..9d0fb3fdeb7c 100644
--- a/pkgs/applications/misc/osm2xmap/default.nix
+++ b/pkgs/applications/misc/osm2xmap/default.nix
@@ -20,6 +20,8 @@ stdenv.mkDerivation rec {
     "INSTALL_SHAREDIR=$(out)/share/"
   ];
 
+  NIX_CFLAGS_COMPILE = [ "-DACCEPT_USE_OF_DEPRECATED_PROJ_API_H" ];
+
   installFlags = [ "DESTDIR=$(out)" ];
 
   buildInputs = [ libroxml proj libyamlcpp boost ];