diff --git a/src/proto/blowfish.pro b/src/proto/blowfish.pro
index d959846..5998fb3 100644
--- a/src/proto/blowfish.pro
+++ b/src/proto/blowfish.pro
@@ -1,6 +1,6 @@
 /* blowfish.c */
 void crypt_blowfish_encode(cryptstate_T *state, char_u *from, size_t len, char_u *to);
 void crypt_blowfish_decode(cryptstate_T *state, char_u *from, size_t len, char_u *to);
-void crypt_blowfish_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
+int crypt_blowfish_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
 int blowfish_self_test(void);
 /* vim: set ft=c : */
diff --git a/src/proto/crypt_zip.pro b/src/proto/crypt_zip.pro
index 74784e1..868b131 100644
--- a/src/proto/crypt_zip.pro
+++ b/src/proto/crypt_zip.pro
@@ -1,5 +1,5 @@
 /* crypt_zip.c */
-void crypt_zip_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
+int crypt_zip_init(cryptstate_T *state, char_u *key, char_u *salt, int salt_len, char_u *seed, int seed_len);
 void crypt_zip_encode(cryptstate_T *state, char_u *from, size_t len, char_u *to);
 void crypt_zip_decode(cryptstate_T *state, char_u *from, size_t len, char_u *to);
 /* vim: set ft=c : */