diff --git a/legacy/firmware/Makefile b/legacy/firmware/Makefile
index 86cdb4a68..06e427949 100644
--- a/legacy/firmware/Makefile
+++ b/legacy/firmware/Makefile
@@ -125,7 +125,7 @@ DEBUG_LINK ?= 0
 DEBUG_LOG  ?= 0
 
 CFLAGS += -Wno-sequence-point
-CFLAGS += -I../vendor/nanopb -Iprotob -DPB_FIELD_16BIT=1 -DPB_ENCODE_ARRAYS_UNPACKED=1
+CFLAGS += -I../vendor/nanopb -Iprotob -DPB_FIELD_16BIT=1 -DPB_ENCODE_ARRAYS_UNPACKED=1 -Wno-unused-variable
 CFLAGS += -DDEBUG_LINK=$(DEBUG_LINK)
 CFLAGS += -DDEBUG_LOG=$(DEBUG_LOG)
 CFLAGS += -DSCM_REVISION='"$(shell git rev-parse HEAD | sed 's:\(..\):\\x\1:g')"'