diff --git a/pkgs/development/python-modules/oslo-log/default.nix b/pkgs/development/python-modules/oslo-log/default.nix
index c72df54a7976..c221fb175b4c 100644
--- a/pkgs/development/python-modules/oslo-log/default.nix
+++ b/pkgs/development/python-modules/oslo-log/default.nix
@@ -37,7 +37,7 @@ buildPythonPackage rec {
 
   # Manually set version because prb wants to get it from the git upstream repository (and we are
   # installing from tarball instead)
-  PBR_VERSION = version;
+  env.PBR_VERSION = version;
 
   build-system = [ setuptools ];