diff --git a/src/server/shared/Database/DatabaseWorker.h b/src/server/shared/Database/DatabaseWorker.h
index db8aff1892d..6371670b79e 100755
--- a/src/server/shared/Database/DatabaseWorker.h
+++ b/src/server/shared/Database/DatabaseWorker.h
@@ -28,7 +28,10 @@
 
 class MySQLConnection;
 
-template <typename T>
+// Forward declare
+template <class T> class DatabaseWorkerPool;
+
+template <class T>
 class DatabaseWorker : public ACE_Task_Base
 {
     public: