diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index 5ea3c8421d4..ba7cb8f1c80 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -7526,7 +7526,7 @@ in modules // {
     };
   };
 
-  nxt_python = buildPythonPackage rec {
+  nxt-python = buildPythonPackage rec {
     version = "unstable-20160819";
     pname = "nxt-python";
     name = "${pname}-${version}";