diff --git a/server/src/Group.h b/server/src/Group.h
index 54f5da2..eab8861 100644
--- a/server/src/Group.h
+++ b/server/src/Group.h
@@ -225,7 +225,7 @@ namespace ts {
 
             sql::SqlManager* sql;
 
-            std::lock_guard group_lock{};
+            std::mutex group_lock{};
             std::vector<std::shared_ptr<Group>> groups;
 
             threads::Mutex cacheLock;