diff --git a/libprocessgroup/processgroup.cpp b/libprocessgroup/processgroup.cpp
index 1f29040..06d386f 100644
--- a/libprocessgroup/processgroup.cpp
+++ b/libprocessgroup/processgroup.cpp
@@ -223,6 +223,13 @@
         std::this_thread::sleep_for(5ms);
     }
 
+    if (!ret && uid >= AID_ISOLATED_START && uid <= AID_ISOLATED_END) {
+        // Isolated UIDs are unlikely to be reused soon after removal,
+        // so free up the kernel resources for the UID level cgroup.
+        const auto uid_path = ConvertUidToPath(cgroup, uid);
+        ret = rmdir(uid_path.c_str());
+    }
+
     return ret;
 }