diff --git a/lib/ssluse.c b/lib/ssluse.c
index 35b0d382ae8bf08e87f2b7aea547aa2cfe15e44c..22d8bcb13f17a0e08653546031c5076ccc02f45a 100644
--- a/lib/ssluse.c
+++ b/lib/ssluse.c
@@ -2786,7 +2786,7 @@ void Curl_ossl_random(struct SessionHandle *data, unsigned char *entropy,
                       size_t length)
 {
   Curl_ossl_seed(data); /* Initiate the seed if not already done */
-  RAND_bytes(entropy, length);
+  RAND_bytes(entropy, curlx_uztosi(length));
 }
 
 void Curl_ossl_md5sum(unsigned char *tmp, /* input */