diff --git a/ed25519/ed25519.h b/ed25519/ed25519.h
index 22fb0fa..a3388f8 100644
--- a/ed25519/ed25519.h
+++ b/ed25519/ed25519.h
@@ -112,6 +112,7 @@ inline static void ge_initeightpoint() {}
 #define ED25519_CUSTOMRANDOM
 #define ED25519_CUSTOMHASH
 #include <sodium/crypto_hash_sha512.h>
+#include <sodium/randombytes.h>
 #include "ed25519-donna/ed25519-donna.h"
 
 static int ed25519_seckey_expand(unsigned char *sk,const unsigned char *seed)
diff --git a/main.c b/main.c
index 0a02962..a0c69f8 100644
--- a/main.c
+++ b/main.c
@@ -817,7 +817,7 @@ end:
 	return 0;
 }
 
-static void addu64toscalar32(u8 *dst,u64 v)
+static void addsztoscalar32(u8 *dst,size_t v)
 {
 	int i;
 	u32 c = 0;
@@ -897,7 +897,7 @@ initseed:
 			}
 			// found!
 			// update secret key with counter
-			addu64toscalar32(sk,counter);
+			addsztoscalar32(sk,counter);
 			// sanity check
 			if (((sk[0] & 248) == sk[0]) && (((sk[31] & 63) | 64) == sk[31])) {
 				/* These operations should be a no-op. */