diff --git a/src/core/ladspa_control.cpp b/src/core/ladspa_control.cpp
index 08a0f9f74..74a985cfc 100644
--- a/src/core/ladspa_control.cpp
+++ b/src/core/ladspa_control.cpp
@@ -36,7 +36,7 @@ ladspaControl::ladspaControl( model * _parent, port_desc_t * _port,
         m_linkEnabledModel( _link, this, tr( "Link channels" ) ),
         m_toggledModel( FALSE, this, m_port->name ),
         m_knobModel( 0, 0, 0, 1, this, m_port->name ),
-	m_tempoSyncKnobModel( 0, 0, 0, 1, 1.0, this )
+	m_tempoSyncKnobModel( 0, 0, 0, 1, m_port->max, this )
 {
 	if( m_link )
 	{