diff --git a/libgamestream/mkcert.c b/libgamestream/mkcert.c
index e3f6b9e..4ced6f6 100644
--- a/libgamestream/mkcert.c
+++ b/libgamestream/mkcert.c
@@ -104,7 +104,18 @@ int mkcert(X509 **x509p, EVP_PKEY **pkeyp, int bits, int serial, int years) {
         x = *x509p;
     }
     
-    rsa = RSA_generate_key(bits, RSA_F4, NULL, NULL);
+    BIGNUM* bne = BN_new(); 
+    if (bne == NULL) {
+        abort();
+        goto err;
+    }
+
+    BN_set_word(bne, RSA_F4);
+    if (RSA_generate_key_ex(rsa, bits, bne, NULL) == 0) {
+        abort();
+        goto err;
+    }
+
     if (!EVP_PKEY_assign_RSA(pk, rsa)) {
         abort();
         goto err;