diff --git a/sources/properties/elementdata.h b/sources/properties/elementdata.h
index b5561ef44..5402d064b 100644
--- a/sources/properties/elementdata.h
+++ b/sources/properties/elementdata.h
@@ -134,6 +134,7 @@ class ElementData : public PropertiesInterface
 		ElementData::Type       m_type = ElementData::Simple;
 
 		ElementData::MasterType m_master_type = ElementData::Coil;
+		int m_max_slaves = -1;
 
 		ElementData::SlaveType  m_slave_type  = ElementData::SSimple;
 		ElementData::SlaveState m_slave_state = ElementData::NO;