diff --git a/lix/libstore/platform/linux.cc b/lix/libstore/platform/linux.cc
index 62f46b53b..804c948ba 100644
--- a/lix/libstore/platform/linux.cc
+++ b/lix/libstore/platform/linux.cc
@@ -858,7 +858,7 @@ void LinuxLocalDerivationGoal::prepareSandbox()
     if (buildUser && (buildUser->getUIDCount() != 1 || settings.useCgroups)) {
         context.cgroup.emplace(
             settings.nixStateDir + "/cgroups",
-            fmt("nix-build-uid-%d", buildUser->getUID()),
+            fmt("nix-build-drvHash-%s", drvPath.hashPart()),
             buildUser->getUID(),
             buildUser->getGID()
         );