1 files changed, 1 insertions, 0 deletions

diff --git a/utils/nwztools/upgtools/fwp.h b/utils/nwztools/upgtools/fwp.h
index dcfe80027e..7b527d47ba 100644
--- a/utils/nwztools/upgtools/fwp.h
+++ b/utils/nwztools/upgtools/fwp.h
@@ -34,6 +34,7 @@ extern "C" {
 #define NWZ_DES_BLOCK   8
 
 int fwp_read(void *in, int size, void *out, uint8_t *key);
+int fwp_write(void *in, int size, void *out, uint8_t *key);
 void fwp_setkey(char key[8]);
 int fwp_crypt(void *buf, int size, int mode);