diff --git a/src/emu/devcb.c b/src/emu/devcb.c
index 089dcd3388b..7d2f6ddb622 100644
--- a/src/emu/devcb.c
+++ b/src/emu/devcb.c
@@ -82,9 +82,10 @@ public:
 
 const input_port_config *devcb_resolver::resolve_port(const char *tag, device_t &current)
 {
-	const input_port_config *result = current.machine().port(tag);
+	astring fullname;
+	const input_port_config *result = current.machine().port(current.siblingtag(fullname, tag));
 	if (result == NULL)
-		throw emu_fatalerror("Unable to find input port '%s' (requested by %s '%s')", tag, current.name(), current.tag());
+		throw emu_fatalerror("Unable to find input port '%s' (requested by %s '%s')", fullname.cstr(), current.name(), current.tag());
 	return result;
 }