diff --git a/crypto/dsa/dsa_ameth.c b/crypto/dsa/dsa_ameth.c
index aac2530951..e22627f851 100644
--- a/crypto/dsa/dsa_ameth.c
+++ b/crypto/dsa/dsa_ameth.c
@@ -133,6 +133,7 @@ static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
     unsigned char *penc = NULL;
     int penclen;
     ASN1_STRING *str = NULL;
+    ASN1_OBJECT *aobj;
 
     dsa = pkey->pkey.dsa;
     if (pkey->save_parameters && dsa->p && dsa->q && dsa->g) {
@@ -159,8 +160,11 @@ static int dsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
         goto err;
     }
 
-    if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(EVP_PKEY_DSA),
-                               ptype, str, penc, penclen))
+    aobj = OBJ_nid2obj(EVP_PKEY_DSA);
+    if (aobj == NULL)
+        goto err;
+
+    if (X509_PUBKEY_set0_param(pk, aobj, ptype, str, penc, penclen))
         return 1;
 
  err: