diff --git a/tests/Hydrogen.Tests/Crypto/HashRandomTests.cs b/tests/Hydrogen.Tests/Crypto/HashRandomTests.cs
index 4ddc68ec..d216b61a 100644
--- a/tests/Hydrogen.Tests/Crypto/HashRandomTests.cs
+++ b/tests/Hydrogen.Tests/Crypto/HashRandomTests.cs
@@ -53,7 +53,7 @@ public void GeneratesCorrectly([Values(CHF.SHA2_256, CHF.Blake2b_128)] CHF chf)
 		var expected = new ByteArrayBuilder();
 		var lastValue = seed;
 		for (var i = 0; i < TotalHashIterations; i++) {
-			var nextHash = Hashers.Hash(chf, lastValue);
+			var nextHash = Hashers.Hash(chf, Tools.Array.Concat<byte>(lastValue, EndianBitConverter.Little.GetBytes((long)i)));
 			expected.Append(nextHash);
 			lastValue = nextHash;
 		}