diff --git a/tmk_core/common.mk b/tmk_core/common.mk
index 6805fa62..83163ecf 100644
--- a/tmk_core/common.mk
+++ b/tmk_core/common.mk
@@ -105,13 +105,13 @@ ifeq (yes,$(strip $(KEYMAP_SECTION_ENABLE)))
     OPT_DEFS += -DKEYMAP_SECTION_ENABLE
 
     ifeq ($(strip $(MCU)),atmega32u2)
-	EXTRALDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr35.x
+	EXTRALDFLAGS += -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr35.x
     else ifeq ($(strip $(MCU)),atmega32u4)
-	EXTRALDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr5.x
+	EXTRALDFLAGS += -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr5.x
     else ifeq ($(strip $(MCU)),at90usb1286)
-	EXTRALDFLAGS = -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr51.x
+	EXTRALDFLAGS += -Wl,-L$(TMK_DIR),-Tldscript_keymap_avr51.x
     else
-	EXTRALDFLAGS = $(error no ldscript for keymap section)
+	EXTRALDFLAGS += $(error no ldscript for keymap section)
     endif
 endif