diff --git a/fastflash/Makefile b/fastflash/Makefile
index 24ca20a..5b768eb 100644
--- a/fastflash/Makefile
+++ b/fastflash/Makefile
@@ -10,6 +10,7 @@ OBJS += ../vendor/trezor-crypto/bignum.small.o
 OBJS += ../vendor/trezor-crypto/ecdsa.small.o
 OBJS += ../vendor/trezor-crypto/secp256k1.small.o
 OBJS += ../vendor/trezor-crypto/sha2.small.o
+OBJS += ../vendor/trezor-crypto/memzero.small.o
 
 CFLAGS += -DUSE_PRECOMPUTED_IV=0
 CFLAGS += -DUSE_PRECOMPUTED_CP=0