diff --git a/wolfcrypt/test/test.c b/wolfcrypt/test/test.c
index c6c82d1f9b..c3f8d41569 100644
--- a/wolfcrypt/test/test.c
+++ b/wolfcrypt/test/test.c
@@ -27902,6 +27902,31 @@ static wc_test_ret_t hpke_test_single(Hpke* hpke)
             ret = WC_TEST_RET_ENC_NC;
     }
 
+    /* Negative test case with NULL argument */
+    if (ret == 0) {
+        ret = wc_HpkeGenerateKeyPair(NULL, &receiverKey, rng);
+        if (ret != BAD_FUNC_ARG)
+            ret = WC_TEST_RET_ENC_EC(ret);
+        else
+            ret = 0;
+    }
+
+    if (ret == 0) {
+        ret = wc_HpkeGenerateKeyPair(hpke, NULL, rng);
+        if (ret != BAD_FUNC_ARG)
+            ret = WC_TEST_RET_ENC_EC(ret);
+        else
+            ret = 0;
+    }
+
+    if (ret == 0) {
+        ret = wc_HpkeGenerateKeyPair(hpke, &receiverKey, NULL);
+        if (ret != BAD_FUNC_ARG)
+            ret = WC_TEST_RET_ENC_EC(ret);
+        else
+            ret = 0;
+    }
+
     if (ephemeralKey != NULL)
         wc_HpkeFreeKey(hpke, hpke->kem, ephemeralKey, hpke->heap);