diff --git a/pkgs/development/libraries/gdcm/default.nix b/pkgs/development/libraries/gdcm/default.nix
index 86d80a529d59..af4a5a38f7eb 100644
--- a/pkgs/development/libraries/gdcm/default.nix
+++ b/pkgs/development/libraries/gdcm/default.nix
@@ -7,7 +7,7 @@
 , ApplicationServices
 , Cocoa
 , enablePython ? false
-, python
+, python ? null
 , swig
 }: