diff --git a/src/gnuk.h b/src/gnuk.h
index 195f5b5..d0c0226 100644
--- a/src/gnuk.h
+++ b/src/gnuk.h
@@ -139,7 +139,7 @@ extern void flash_do_release (const uint8_t *);
 extern const uint8_t *flash_do_write (uint8_t nr, const uint8_t *data, int len);
 extern uint8_t *flash_key_alloc (void);
 extern int flash_key_write (uint8_t *key_addr, const uint8_t *key_data,
-			    const uint8_t *modulus);
+			    const uint8_t *pubkey, int pubkey_len);
 extern void flash_keystore_release (void);
 extern void flash_set_data_pool_last (const uint8_t *p);
 extern void flash_clear_halfword (uint32_t addr);