diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 4fc5398c..d91e6d6d 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -17,11 +17,11 @@ SRC +=	$(COMMON_DIR)/host.c \
 
 
 # Option modules
-ifdef UNIMAP_ENABLE
+ifeq (yes,$(strip $(UNIMAP_ENABLE)))
     SRC += $(COMMON_DIR)/unimap.c
     OPT_DEFS += -DUNIMAP_ENABLE
 else
-    ifdef ACTIONMAP_ENABLE
+    ifeq (yes,$(strip $(ACTIONMAP_ENABLE)))
 	SRC += $(COMMON_DIR)/actionmap.c
 	OPT_DEFS += -DACTIONMAP_ENABLE
     else
@@ -29,58 +29,58 @@ else
     endif
 endif
 
-ifdef BOOTMAGIC_ENABLE
+ifeq (yes,$(strip $(BOOTMAGIC_ENABLE)))
     SRC += $(COMMON_DIR)/bootmagic.c
     SRC += $(COMMON_DIR)/avr/eeconfig.c
     OPT_DEFS += -DBOOTMAGIC_ENABLE
 endif
 
-ifdef MOUSEKEY_ENABLE
+ifeq (yes,$(strip $(MOUSEKEY_ENABLE)))
     SRC += $(COMMON_DIR)/mousekey.c
     OPT_DEFS += -DMOUSEKEY_ENABLE
     OPT_DEFS += -DMOUSE_ENABLE
 endif
 
-ifdef EXTRAKEY_ENABLE
+ifeq (yes,$(strip $(EXTRAKEY_ENABLE)))
     OPT_DEFS += -DEXTRAKEY_ENABLE
 endif
 
-ifdef CONSOLE_ENABLE
+ifeq (yes,$(strip $(CONSOLE_ENABLE)))
     OPT_DEFS += -DCONSOLE_ENABLE
 else
     OPT_DEFS += -DNO_PRINT
     OPT_DEFS += -DNO_DEBUG
 endif
 
-ifdef COMMAND_ENABLE
+ifeq (yes,$(strip $(COMMAND_ENABLE)))
     SRC += $(COMMON_DIR)/command.c
     OPT_DEFS += -DCOMMAND_ENABLE
 endif
 
-ifdef NKRO_ENABLE
+ifeq (yes,$(strip $(NKRO_ENABLE)))
     OPT_DEFS += -DNKRO_ENABLE
 endif
 
-ifdef USB_6KRO_ENABLE
+ifeq (yes,$(strip $(USB_6KRO_ENABLE)))
     OPT_DEFS += -DUSB_6KRO_ENABLE
 endif
 
-ifdef KEYBOARD_LOCK_ENABLE
+ifeq (yes, $(strip $(KEYBOARD_LOCK_ENABLE)))
     OPT_DEFS += -DKEYBOARD_LOCK_ENABLE
 endif
 
-ifdef SLEEP_LED_ENABLE
+ifeq (yes,$(strip $(SLEEP_LED_ENABLE)))
     SRC += $(COMMON_DIR)/avr/sleep_led.c
     OPT_DEFS += -DSLEEP_LED_ENABLE
     OPT_DEFS += -DNO_SUSPEND_POWER_DOWN
 endif
 
-ifdef BACKLIGHT_ENABLE
+ifeq (yes,$(strip $(BACKLIGHT_ENABLE)))
     SRC += $(COMMON_DIR)/backlight.c
     OPT_DEFS += -DBACKLIGHT_ENABLE
 endif
 
-ifdef KEYMAP_SECTION_ENABLE
+ifeq (yes,$(strip $(KEYMAP_SECTION_ENABLE)))
     OPT_DEFS += -DKEYMAP_SECTION_ENABLE
 
     ifeq ($(strip $(MCU)),atmega32u2)