diff --git a/src/emu/netlist/nl_base.c b/src/emu/netlist/nl_base.c
index 6db0168175e..68c9a7de4a4 100644
--- a/src/emu/netlist/nl_base.c
+++ b/src/emu/netlist/nl_base.c
@@ -357,7 +357,7 @@ template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &
 template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &dev, const pstring &sname, netlist_param_logic_t &param, const int initialVal);
 template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &dev, const pstring &sname, netlist_param_str_t &param, const char * initialVal);
 template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &dev, const pstring &sname, netlist_param_str_t &param, const pstring &initialVal);
-template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &dev, const pstring &sname, netlist_param_multi_t &param, const char * initialVal);
+template ATTR_COLD void netlist_device_t::register_param(netlist_core_device_t &dev, const pstring &sname, netlist_param_multi_t &param, const char * const initialVal);
 
 
 // ----------------------------------------------------------------------------------------