diff --git a/mpy-cross/Makefile b/mpy-cross/Makefile
index f80ee761b7..971f2f81aa 100644
--- a/mpy-cross/Makefile
+++ b/mpy-cross/Makefile
@@ -18,7 +18,7 @@ INC += -I$(TOP)
 
 # compiler settings
 CWARN = -Wall -Werror
-CWARN += -Wpointer-arith -Wuninitialized
+CWARN += -Wextra -Wno-unused-parameter -Wpointer-arith
 CFLAGS = $(INC) $(CWARN) -std=gnu99 $(CFLAGS_MOD) $(COPT) $(CFLAGS_EXTRA)
 CFLAGS += -fdata-sections -ffunction-sections -fno-asynchronous-unwind-tables