diff --git a/mk/board_avr.mk b/mk/board_avr.mk
index 678be9b3fb..f1d2357089 100644
--- a/mk/board_avr.mk
+++ b/mk/board_avr.mk
@@ -11,7 +11,7 @@ DEFINES        +=   -DSKETCH=\"$(SKETCH)\" -DAPM_BUILD_DIRECTORY=APM_BUILD_$(SKE
 DEFINES        +=   $(EXTRAFLAGS) # from user config.mk
 DEFINES        +=   -DCONFIG_HAL_BOARD=$(HAL_BOARD)
 WARNFLAGS       =   -Wformat -Wall -Wshadow -Wpointer-arith -Wcast-align
-WARNFLAGS      +=   -Wwrite-strings -Wformat=2
+WARNFLAGS      +=   -Wwrite-strings -Wformat=2 -Wno-unused-parameter -Wno-missing-field-initializers
 WARNFLAGSCXX    =   -Wno-reorder
 DEPFLAGS        =   -MD -MT $@