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-rw-r--r--lib/crypto/c_src/crypto.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/crypto/c_src/crypto.c b/lib/crypto/c_src/crypto.c
index 240bfc8341..5270c9131e 100644
--- a/lib/crypto/c_src/crypto.c
+++ b/lib/crypto/c_src/crypto.c
@@ -1362,7 +1362,7 @@ static ERL_NIF_TERM cmac_nif(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[]
ErlNifBinary key;
ErlNifBinary data;
ERL_NIF_TERM ret;
- unsigned ret_size;
+ size_t ret_size;
if (!enif_inspect_iolist_as_binary(env, argv[1], &key)
|| !(cipherp = get_cipher_type(argv[0], key.size))