diff --git a/src/libsodium/randombytes/salsa20/randombytes_salsa20_random.c b/src/libsodium/randombytes/salsa20/randombytes_salsa20_random.c
index 4d355a3e..71a69fc1 100644
--- a/src/libsodium/randombytes/salsa20/randombytes_salsa20_random.c
+++ b/src/libsodium/randombytes/salsa20/randombytes_salsa20_random.c
@@ -178,7 +178,7 @@ randombytes_salsa20_random_stir(void)
         abort();
     }
 #else /* _WIN32 */
-    if (! CryptGenRandom(stream.hcrypt_prov, sizeof m0, m0)) {
+    if (! CryptGenRandom(stream.hcrypt_prov, sizeof m0, (BYTE *) m0)) {
         abort();
     }
 #endif
diff --git a/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c b/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c
index c82cb563..b8ecd72e 100644
--- a/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c
+++ b/src/libsodium/randombytes/sysrandom/randombytes_sysrandom.c
@@ -167,7 +167,7 @@ randombytes_sysrandom_buf(void * const buf, const size_t size)
         abort();
     }
 #else
-    if (! CryptGenRandom(stream.hcrypt_prov, size, buf)) {
+    if (! CryptGenRandom(stream.hcrypt_prov, size, (BYTE *) buf)) {
         abort();
     }
 #endif