diff --git a/src/test/app/NetworkID_test.cpp b/src/test/app/NetworkID_test.cpp
index 693459239..830a931e2 100644
--- a/src/test/app/NetworkID_test.cpp
+++ b/src/test/app/NetworkID_test.cpp
@@ -47,9 +47,7 @@ public:
     void
     testNetworkID()
     {
-        testcase(
-            "Require txn NetworkID to be specified (or not) depending on the "
-            "network ID of the node");
+        testcase("network_id");
         using namespace jtx;
 
         auto const alice = Account{"alice"};
@@ -67,14 +65,9 @@ public:
                 jv[jss::Destination] = alice.human();
                 jv[jss::TransactionType] = "Payment";
                 jv[jss::Amount] = "10000000000";
-                if (env.app().config().NETWORK_ID > 1024)
-                    jv[jss::NetworkID] =
-                        std::to_string(env.app().config().NETWORK_ID);
-
                 env(jv, fee(1000), sig(env.master));
             }
 
-            // run tx
             env(jv, fee(1000), ter(expectedOutcome));
             env.close();
         };
@@ -127,11 +120,25 @@ public:
             test::jtx::Env env{*this, makeNetworkConfig(1025)};
             BEAST_EXPECT(env.app().config().NETWORK_ID == 1025);
 
-            // try to submit a txn without network id, this should not work
+            {
+                env.fund(XRP(200), alice);
+                // try to submit a txn without network id, this should not work
+                Json::Value jvn;
+                jvn[jss::Account] = alice.human();
+                jvn[jss::TransactionType] = jss::AccountSet;
+                jvn[jss::Fee] = to_string(env.current()->fees().base);
+                jvn[jss::Sequence] = env.seq(alice);
+                jvn[jss::LastLedgerSequence] = env.current()->info().seq + 2;
+                auto jt = env.jtnofill(jvn);
+                Serializer s;
+                jt.stx->add(s);
+                BEAST_EXPECT(env.rpc("submit", strHex(s.slice()))[jss::result][jss::engine_result] == "telREQUIRES_NETWORK_ID");
+                env.close();
+            }
+
             Json::Value jv;
             jv[jss::Account] = alice.human();
             jv[jss::TransactionType] = jss::AccountSet;
-            runTx(env, jv, telREQUIRES_NETWORK_ID);
 
             // try to submit with wrong network id
             jv[jss::NetworkID] = 0;
diff --git a/src/test/jtx/Env.h b/src/test/jtx/Env.h
index 04c51c206..6002031b3 100644
--- a/src/test/jtx/Env.h
+++ b/src/test/jtx/Env.h
@@ -445,6 +445,18 @@ public:
         return jt;
     }
 
+    /** Create a JTx from parameters. */
+    template <class JsonValue, class... FN>
+    JTx
+    jtnofill(JsonValue&& jv, FN const&... fN)
+    {
+        JTx jt(std::forward<JsonValue>(jv));
+        invoke(jt, fN...);
+        autofill_sig(jt);
+        jt.stx = st(jt);
+        return jt;
+    }
+
     /** Create JSON from parameters.
         This will apply funclets and autofill.
     */
diff --git a/src/test/jtx/impl/Env.cpp b/src/test/jtx/impl/Env.cpp
index e1864839d..4ebc9e8b0 100644
--- a/src/test/jtx/impl/Env.cpp
+++ b/src/test/jtx/impl/Env.cpp
@@ -432,6 +432,11 @@ Env::autofill(JTx& jt)
         jtx::fill_fee(jv, *current());
     if (jt.fill_seq)
         jtx::fill_seq(jv, *current());
+    
+    uint32_t networkID = app().config().NETWORK_ID;
+    if (!jv.isMember(jss::NetworkID) && networkID > 1024)
+        jv[jss::NetworkID] = std::to_string(networkID);
+    
     // Must come last
     try
     {