diff --git a/src/ripple/app/tests/Regression_test.cpp b/src/ripple/app/tests/Regression_test.cpp
index 32a32832e..df7fe7639 100644
--- a/src/ripple/app/tests/Regression_test.cpp
+++ b/src/ripple/app/tests/Regression_test.cpp
@@ -18,6 +18,7 @@
 #include <BeastConfig.h>
 #include <ripple/test/jtx.h>
 #include <ripple/app/tx/apply.h>
+#include <ripple/basics/StringUtilities.h>
 
 namespace ripple {
 namespace test {
@@ -111,10 +112,57 @@ struct Regression_test : public beast::unit_test::suite
             "next->info().drops == expectedDrops");
     }
 
+    void testSecp256r1key ()
+    {
+        testcase("Signing with a secp256r1 key should fail gracefully");
+        using namespace jtx;
+        Env env(*this);
+
+        // Test case we'll use.
+        auto test256r1key = [&env] (Account const& acct)
+        {
+            auto const baseFee = env.current()->fees().base;
+            std::uint32_t const acctSeq = env.seq (acct);
+            Json::Value jsonNoop = env.json (
+                noop (acct), fee(baseFee), seq(acctSeq), sig(acct));
+            JTx jt = env.jt (jsonNoop);
+            jt.fill_sig = false;
+
+            // Random secp256r1 public key generated by
+            // https://kjur.github.io/jsrsasign/sample-ecdsa.html
+            std::string const secp256r1PubKey =
+                "045d02995ec24988d9a2ae06a3733aa35ba0741e87527"
+                "ed12909b60bd458052c944b24cbf5893c3e5be321774e"
+                "5082e11c034b765861d0effbde87423f8476bb2c";
+
+            // Set the key in the JSON.
+            jt.jv["SigningPubKey"] = secp256r1PubKey;
+
+            // Set the same key in the STTx.
+            auto secp256r1Sig = std::make_unique<STTx>(*(jt.stx));
+            auto pubKeyBlob = strUnHex (secp256r1PubKey);
+            assert (pubKeyBlob.second); // Hex for public key must be valid
+            secp256r1Sig->setFieldVL
+                (sfSigningPubKey, std::move(pubKeyBlob.first));
+            jt.stx.reset (secp256r1Sig.release());
+
+            env (jt, ter (temINVALID));
+        };
+
+        Account const alice {"alice", KeyType::secp256k1};
+        Account const becky {"becky", KeyType::ed25519};
+
+        env.fund(XRP(10000), alice, becky);
+
+        test256r1key (alice);
+        test256r1key (becky);
+    }
+
     void run() override
     {
         testOffer1();
         testLowBalanceDestroy();
+        testSecp256r1key();
     }
 };