diff --git a/make/mcu-defs.mk b/make/mcu-defs.mk
index 5eb4d4bd..f32c972d 100644
--- a/make/mcu-defs.mk
+++ b/make/mcu-defs.mk
@@ -8,16 +8,18 @@
 
 include $(MODDIR)/make/mcu-tags.mk
 
-ifeq ($(MCU_BOARD_MODEL),)
-  $(error MCU_BOARD_MODEL not specified)
-endif
-
-ifeq ($(MCU_FLASH_OFFSET),)
-  $(error MCU_FLASH_OFFSET not specified)
-endif
-
-ifeq ($(MCU_FLASH_SIZE),)
-  $(error MCU_FLASH_SIZE not specified)
+ifneq ($(MAKECMDGOALS),clean)
+  ifeq ($(MCU_BOARD_MODEL),)
+    $(error MCU_BOARD_MODEL not specified)
+  endif
+  
+  ifeq ($(MCU_FLASH_OFFSET),)
+    $(error MCU_FLASH_OFFSET not specified)
+  endif
+  
+  ifeq ($(MCU_FLASH_SIZE),)
+    $(error MCU_FLASH_SIZE not specified)
+  endif
 endif
 
 MCU_PRODUCT_TMPL_DIR        ?= $(MODDIR)/tmpl/products