diff --git a/lib/db_ido_mysql/idomysqlconnection.cpp b/lib/db_ido_mysql/idomysqlconnection.cpp
index 9d06fbdee..f5c0f8f72 100644
--- a/lib/db_ido_mysql/idomysqlconnection.cpp
+++ b/lib/db_ido_mysql/idomysqlconnection.cpp
@@ -39,8 +39,8 @@ using namespace icinga;
 REGISTER_TYPE(IdoMysqlConnection);
 REGISTER_STATSFUNCTION(IdoMysqlConnectionStats, &IdoMysqlConnection::StatsFunc);
 
-IdoMysqlConnection::IdoMysqlConnection(void) 
-	: m_Connected(false) 
+IdoMysqlConnection::IdoMysqlConnection(void)
+	: m_QueryQueue(500000), m_Connected(false)
 { }
 
 Value IdoMysqlConnection::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)
diff --git a/lib/db_ido_pgsql/idopgsqlconnection.cpp b/lib/db_ido_pgsql/idopgsqlconnection.cpp
index 1c8653ac5..a64e46de3 100644
--- a/lib/db_ido_pgsql/idopgsqlconnection.cpp
+++ b/lib/db_ido_pgsql/idopgsqlconnection.cpp
@@ -41,8 +41,8 @@ REGISTER_TYPE(IdoPgsqlConnection);
 
 REGISTER_STATSFUNCTION(IdoPgsqlConnectionStats, &IdoPgsqlConnection::StatsFunc);
 
-IdoPgsqlConnection::IdoPgsqlConnection(void) 
-	: m_Connection(NULL)
+IdoPgsqlConnection::IdoPgsqlConnection(void)
+	: m_QueryQueue(500000), m_Connection(NULL)
 { }
 
 Value IdoPgsqlConnection::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)