diff --git a/core/src/test/java/com/google/bitcoin/core/FullBlockTestGenerator.java b/core/src/test/java/com/google/bitcoin/core/FullBlockTestGenerator.java
index 3162e253..c0a31100 100644
--- a/core/src/test/java/com/google/bitcoin/core/FullBlockTestGenerator.java
+++ b/core/src/test/java/com/google/bitcoin/core/FullBlockTestGenerator.java
@@ -1117,16 +1117,9 @@ public class FullBlockTestGenerator {
         
         Block b61 = createNextBlock(b60, chainHeadHeight + 19, out18, null);
         {
-            final Transaction tx = b61.getTransactions().get(0);
-            byte[] scriptBytes = tx.getInputs().get(0).getScriptBytes();
-            // createNextBlock will increment a uint16 in the first script bytes of each new block.
-            int tmp = (scriptBytes[0] | (scriptBytes[1] << 8)) - 1;
-            scriptBytes[0] = (byte) tmp;
-            scriptBytes[1] = (byte) (tmp >> 8);
-            tx.getInputs().get(0).setScriptBytes(scriptBytes);
+            b61.getTransactions().get(0).getInput(0).setScriptBytes(b60.getTransactions().get(0).getInput(0).getScriptBytes());
             b61.unCache();
-            final Transaction tx2 = b60.getTransactions().get(0);
-            Preconditions.checkState(tx.equals(tx2));
+            Preconditions.checkState(b61.getTransactions().get(0).equals(b60.getTransactions().get(0)));
         }
         b61.solve();
         blocks.add(new BlockAndValidity(blockToHeightMap, b61, false, true, b60.getHash(), chainHeadHeight + 18, "b61"));