diff --git a/crypto/x509/v3_lib.c b/crypto/x509/v3_lib.c
index 5ffeb75d9f5b2af83abb21415507067dc8684bc9..f0b82bb220083411803dd09d02e0a9b5f177adf6 100644
--- a/crypto/x509/v3_lib.c
+++ b/crypto/x509/v3_lib.c
@@ -99,7 +99,11 @@ int X509V3_EXT_add_alias(int nid_to, int nid_from)
     *tmpext = *ext;
     tmpext->ext_nid = nid_to;
     tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
-    return X509V3_EXT_add(tmpext);
+    if (!X509V3_EXT_add(tmpext)) {
+        OPENSSL_free(tmpext);
+        return 0;
+    }
+    return 1;
 }
 
 void X509V3_EXT_cleanup(void)