diff --git a/src/misc/pem/pem_ssh.c b/src/misc/pem/pem_ssh.c
index 00ae44805..2ec386bdc 100644
--- a/src/misc/pem/pem_ssh.c
+++ b/src/misc/pem/pem_ssh.c
@@ -53,7 +53,7 @@ struct kdf_options {
    const char *name;
    const struct blockcipher_info *cipher;
    unsigned char salt[64];
-   ulong32 saltlen;
+   unsigned long saltlen;
    ulong32 num_rounds;
    struct password pw;
 };