--- a/mpy-cross/Makefile
+++ b/mpy-cross/Makefile
@@ -17,7 +17,7 @@
 INC += -I$(TOP)
 
 # compiler settings
-CWARN = -Wall -Werror
+CWARN = -Wall
 CWARN += -Wextra -Wno-unused-parameter -Wpointer-arith
 CFLAGS += $(INC) $(CWARN) -std=gnu99 $(COPT) $(CFLAGS_EXTRA)
 CFLAGS += -fdata-sections -ffunction-sections -fno-asynchronous-unwind-tables