diff --git a/lib/make/mb_msxrom.mk b/lib/make/mb_msxrom.mk
index 24121a7..a991e66 100644
--- a/lib/make/mb_msxrom.mk
+++ b/lib/make/mb_msxrom.mk
@@ -94,7 +94,7 @@ define mb_msxrom_machine_Philips_NMS_8250
 	$(call mb_msxrom_file,$(1)-omsx/share/systemroms/machines,machines/philips/nms8250_disk.rom)
 endef
 
-define mb_msxrom_machine_Toshiba_HX-21.xml
+define mb_msxrom_machine_Toshiba_HX-21
 	$(call mb_msxrom_file,$(1)-omsx/share/systemroms/machines,machines/toshiba/HX21-IC2.BIN)
 	$(call mb_msxrom_file,$(1)-omsx/share/systemroms/machines,machines/toshiba/HX21-IC3.BIN)
 endef