diff --git a/keyboards/mnk1800s/rules.mk b/keyboards/mnk1800s/rules.mk
index 3e71d4e8d77..bc2fdaccd8b 100755
--- a/keyboards/mnk1800s/rules.mk
+++ b/keyboards/mnk1800s/rules.mk
@@ -1,6 +1,12 @@
 # MCU name
 MCU = STM32F072
 
+# Bootloader selection
+BOOTLOADER = stm32-dfu
+
+# Wildcard to allow APM32 MCU
+DFU_SUFFIX_ARGS = -v FFFF -p FFFF
+
 # Do not put the microcontroller into power saving mode
 # when we get USB suspend event. We want it to keep updating
 # backlight effects.
@@ -19,4 +25,3 @@ NKRO_ENABLE = yes           # USB Nkey Rollover
 BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality
 RGBLIGHT_ENABLE = no        # Enable keyboard RGB underglow
 AUDIO_ENABLE = no           # Audio output
-NO_USB_STARTUP_CHECK = no   # Disable initialization only when usb is plugged in
diff --git a/keyboards/mnk50/rules.mk b/keyboards/mnk50/rules.mk
index 26154419de1..bc2fdaccd8b 100755
--- a/keyboards/mnk50/rules.mk
+++ b/keyboards/mnk50/rules.mk
@@ -4,6 +4,9 @@ MCU = STM32F072
 # Bootloader selection
 BOOTLOADER = stm32-dfu
 
+# Wildcard to allow APM32 MCU
+DFU_SUFFIX_ARGS = -v FFFF -p FFFF
+
 # Do not put the microcontroller into power saving mode
 # when we get USB suspend event. We want it to keep updating
 # backlight effects.