diff --git a/keyboards/obelus/rules.mk b/keyboards/obelus/rules.mk
index a84c0862..d999b118 100644
--- a/keyboards/obelus/rules.mk
+++ b/keyboards/obelus/rules.mk
@@ -51,18 +51,18 @@ OPT_DEFS += -DBOOTLOADER_SIZE=4096
 # Build Options
 #   change yes to no to disable
 #
-BOOTMAGIC_ENABLE ?= no      # Virtual DIP switch configuration(+1000)
-MOUSEKEY_ENABLE ?= no       # Mouse keys(+4700)
-EXTRAKEY_ENABLE ?= yes       # Audio control and System control(+450)
-CONSOLE_ENABLE ?= no        # Console for debug(+400)
-COMMAND_ENABLE ?= no        # Commands for debug and configuration
+BOOTMAGIC_ENABLE = no      # Virtual DIP switch configuration(+1000)
+MOUSEKEY_ENABLE = no       # Mouse keys(+4700)
+EXTRAKEY_ENABLE = yes       # Audio control and System control(+450)
+CONSOLE_ENABLE = no        # Console for debug(+400)
+COMMAND_ENABLE = no        # Commands for debug and configuration
 # Do not enable SLEEP_LED_ENABLE. it uses the same timer as BACKLIGHT_ENABLE
-SLEEP_LED_ENABLE ?= no       # Breathing sleep LED during USB suspend
+SLEEP_LED_ENABLE = no       # Breathing sleep LED during USB suspend
 # if this doesn't work, see here: https://github.com/tmk/tmk_keyboard/wiki/FAQ#nkro-doesnt-work
-NKRO_ENABLE ?= no            # USB Nkey Rollover
-BACKLIGHT_ENABLE ?= no       # Enable keyboard backlight functionality on B7 by default
-MIDI_ENABLE ?= yes            # MIDI controls
-UNICODE_ENABLE ?= no         # Unicode
-BLUETOOTH_ENABLE ?= no       # Enable Bluetooth with the Adafruit EZ-Key HID
-AUDIO_ENABLE ?= yes           # Audio output on port C6
-FAUXCLICKY_ENABLE ?= no      # Use buzzer to emulate clicky switches
+NKRO_ENABLE = no            # USB Nkey Rollover
+BACKLIGHT_ENABLE = no       # Enable keyboard backlight functionality on B7 by default
+MIDI_ENABLE = yes            # MIDI controls
+UNICODE_ENABLE = no         # Unicode
+BLUETOOTH_ENABLE = no       # Enable Bluetooth with the Adafruit EZ-Key HID
+AUDIO_ENABLE = yes           # Audio output on port C6
+FAUXCLICKY_ENABLE = no      # Use buzzer to emulate clicky switches