diff --git a/pkgs/maps/default.nix b/pkgs/maps/default.nix
index 721b9a1..f89f4f4 100644
--- a/pkgs/maps/default.nix
+++ b/pkgs/maps/default.nix
@@ -67,6 +67,7 @@ in stdenv.mkDerivation {
   ];
   GIO_EXTRA_MODULES = [ "${glib-networking.out}/lib/gio/modules" ];
   RXI_JSON="${rxi-json}/";
+  CAIRO_TRACE_SO = "${cairo.out}/lib/cairo/libcairo-trace.so";
 
   makeFlags = [ "PREFIX=${placeholder "out"}" "NAME=${pname}" ];