diff --git a/n64.mk b/n64.mk
index 5d8f39cc5a..7c289b6289 100644
--- a/n64.mk
+++ b/n64.mk
@@ -103,8 +103,8 @@ N64_TOOLFLAGS += $(if $(N64_ROM_CATEGORY),--category $(N64_ROM_CATEGORY))
 N64_TOOLFLAGS += $(if $(N64_ROM_REGION),--region $(N64_ROM_REGION))
 N64_ED64ROMCONFIGFLAGS =  $(if $(N64_ROM_SAVETYPE),--savetype $(N64_ROM_SAVETYPE))
 N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_EXPANSIONPAK),--expansionpak $(N64_ROM_EXPANSIONPAK))
-N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_RTC),--rtc) 
-N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_REGIONFREE),--regionfree)
+N64_ED64ROMCONFIGFLAGS += $(if $(filter-out 0,$(N64_ROM_RTC)),--rtc)
+N64_ED64ROMCONFIGFLAGS += $(if $(filter-out 0,$(N64_ROM_REGIONFREE)),--regionfree)
 N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_CONTROLLER1),--controller1 $(N64_ROM_CONTROLLER1))
 N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_CONTROLLER2),--controller2 $(N64_ROM_CONTROLLER2))
 N64_ED64ROMCONFIGFLAGS += $(if $(N64_ROM_CONTROLLER3),--controller3 $(N64_ROM_CONTROLLER3))