diff --git a/src/emu/ioport.h b/src/emu/ioport.h
index 718ce3c1b25..93dd77820ba 100644
--- a/src/emu/ioport.h
+++ b/src/emu/ioport.h
@@ -1606,6 +1606,7 @@ ATTR_COLD void INPUT_PORTS_NAME(_name)(device_t &owner, ioport_list &portlist, a
 // analog adjuster definition
 #define PORT_ADJUSTER(_default, _name) \
 	configurer.field_alloc(IPT_ADJUSTER, (_default), 0xff, (_name)); \
+	configurer.field_set_min_max(0, 100); \
 
 // config definition
 #define PORT_CONFNAME(_mask, _default, _name) \
diff --git a/src/emu/ui.c b/src/emu/ui.c
index 648c6b4236d..e6d4a386f2c 100644
--- a/src/emu/ui.c
+++ b/src/emu/ui.c
@@ -1670,7 +1670,7 @@ static slider_state *slider_init(running_machine &machine)
 			if (field->type() == IPT_ADJUSTER)
 			{
 				void *param = (void *)field;
-				*tailptr = slider_alloc(machine, field->name(), 0, field->defvalue(), 100, 1, slider_adjuster, param);
+				*tailptr = slider_alloc(machine, field->name(), field->minval(), field->defvalue(), field->maxval(), 1, slider_adjuster, param);
 				tailptr = &(*tailptr)->next;
 			}