diff --git a/src/server/shared/Database/QueryResult.h b/src/server/shared/Database/QueryResult.h
index 2c09cb19c81..e32b16555bc 100755
--- a/src/server/shared/Database/QueryResult.h
+++ b/src/server/shared/Database/QueryResult.h
@@ -58,7 +58,7 @@ class ResultSet
         MYSQL_FIELD* _fields;
 };
 
-typedef Trinity::AutoPtr<ResultSet, ACE_Null_Mutex> QueryResult;
+typedef Trinity::AutoPtr<ResultSet, ACE_Thread_Mutex> QueryResult;
 
 class PreparedResultSet
 {
@@ -103,7 +103,7 @@ class PreparedResultSet
 
 };
 
-typedef Trinity::AutoPtr<PreparedResultSet, ACE_Null_Mutex> PreparedQueryResult;
+typedef Trinity::AutoPtr<PreparedResultSet, ACE_Thread_Mutex> PreparedQueryResult;
 
 #endif