diff --git a/crypto/dh/dh_ameth.c b/crypto/dh/dh_ameth.c
index 6ec582f5f3..8430872a9a 100644
--- a/crypto/dh/dh_ameth.c
+++ b/crypto/dh/dh_ameth.c
@@ -207,6 +207,11 @@ static int dh_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
 
     ASN1_STRING_clear_free(prkey);
 
+    if (dplen <= 0) {
+        ERR_raise(ERR_LIB_DH, DH_R_BN_ERROR);
+        goto err;
+    }
+
     if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
                          V_ASN1_SEQUENCE, params, dp, dplen)) {
         OPENSSL_clear_free(dp, dplen);