diff --git a/pkgs/development/python-modules/mxnet/default.nix b/pkgs/development/python-modules/mxnet/default.nix
index b42ba43501fe..5dcd11a257dd 100644
--- a/pkgs/development/python-modules/mxnet/default.nix
+++ b/pkgs/development/python-modules/mxnet/default.nix
@@ -30,7 +30,7 @@ buildPythonPackage {
     "numpy"
   ];
 
-  LD_LIBRARY_PATH = lib.makeLibraryPath [ pkgs.mxnet ];
+  env.LD_LIBRARY_PATH = toString (lib.makeLibraryPath [ pkgs.mxnet ]);
 
   postPatch = ''
     # Required to support numpy >=1.24 where np.bool is removed in favor of just bool