diff --git a/src/main/java/org/bitcoinj/core/AuxPoW.java b/src/main/java/org/bitcoinj/core/AuxPoW.java
index 3804b6e9..f2d007ae 100644
--- a/src/main/java/org/bitcoinj/core/AuxPoW.java
+++ b/src/main/java/org/bitcoinj/core/AuxPoW.java
@@ -355,7 +355,10 @@ public class AuxPoW extends ChildMessage {
 
         if (getChainMerkleBranch().getIndex() != getExpectedIndex(nonce, ((AuxPoWNetworkParameters) params).getChainID(), getChainMerkleBranch().size())) {
             if (throwException) {
-                throw new VerificationException("Aux POW wrong index");
+                throw new VerificationException("Aux POW wrong index in chain merkle branch for chain ID "
+                    + ((AuxPoWNetworkParameters) params).getChainID() + ". Was "
+                    + getChainMerkleBranch().getIndex() + ", expected "
+                    + getExpectedIndex(nonce, ((AuxPoWNetworkParameters) params).getChainID(), getChainMerkleBranch().size()));
             }
             return false;
         }
@@ -402,12 +405,20 @@ public class AuxPoW extends ChildMessage {
         // Choose a pseudo-random slot in the chain merkle tree
         // but have it be fixed for a size/nonce/chain combination.
 
-        long rand = nonce;
+        // We do most of the maths with a signed 32 bit integer, as the operation is
+        // the same as the 32 unsigned integer that the reference version uses
+        int rand = (int) nonce;
         rand = rand * 1103515245 + 12345;
         rand += chainId;
         rand = rand * 1103515245 + 12345;
 
-        return (int) (rand % (1L << merkleHeight));
+        // At this point, we need to flip the value to its positive version,
+        // so we switch to a 64 bit signed integer for the last calculations
+        long longRand = rand & 0xffffffffl;
+
+        longRand %= (1 << merkleHeight);
+
+        return (int) longRand;
     }
 
     public Transaction getTransaction() {
diff --git a/src/test/java/org/bitcoinj/core/DogecoinBlockTest.java b/src/test/java/org/bitcoinj/core/DogecoinBlockTest.java
index 79062bfc..85c0c486 100644
--- a/src/test/java/org/bitcoinj/core/DogecoinBlockTest.java
+++ b/src/test/java/org/bitcoinj/core/DogecoinBlockTest.java
@@ -122,6 +122,31 @@ public class DogecoinBlockTest {
         assertTrue(auxpow.checkProofOfWork(block.getHash(), block.getDifficultyTargetAsInteger(), false));
     }
 
+    /**
+     * Confirm parsing of block with a nonce value above Integer.MAX_VALUE.
+     * See https://github.com/rnicoll/libdohj/pull/7
+     * 
+     * @throws IOException 
+     */
+    @Test
+    public void shouldParseBlock748634() throws IOException {
+        byte[] payload = Util.getBytes(getClass().getResourceAsStream("dogecoin_block748634.bin"));
+        AltcoinSerializer serializer = (AltcoinSerializer)params.getDefaultSerializer();
+        final AltcoinBlock block = (AltcoinBlock)serializer.makeBlock(payload);
+        assertEquals("bd98a06391115285265c04984e8505229739f6ffa5d498929a91fbe7c281ea7b", block.getHashAsString());
+        assertEquals(0, block.getNonce());
+
+        // Check block version values
+        assertEquals(2, block.getVersion());
+        assertEquals(98, block.getChainID());
+        assertTrue(block.getVersionFlags().get(0));
+
+        final AuxPoW auxpow = block.getAuxPoW();
+        assertNotNull(auxpow);
+
+        assertTrue(auxpow.checkProofOfWork(block.getHash(), block.getDifficultyTargetAsInteger(), true));
+    }
+
     /**
      * Confirm parsing of block with a nonce value above Integer.MAX_VALUE.
      * See https://github.com/rnicoll/libdohj/issues/5
diff --git a/src/test/resources/org/bitcoinj/core/dogecoin_block250000.hex b/src/test/resources/org/bitcoinj/core/dogecoin_block250000.hex
deleted file mode 100644
index 50777646..00000000
--- a/src/test/resources/org/bitcoinj/core/dogecoin_block250000.hex
+++ /dev/null
@@ -1 +0,0 @@
-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diff --git a/src/test/resources/org/bitcoinj/core/dogecoin_block371337.hex b/src/test/resources/org/bitcoinj/core/dogecoin_block371337.hex
deleted file mode 100644
index c8458e1b..00000000
--- a/src/test/resources/org/bitcoinj/core/dogecoin_block371337.hex
+++ /dev/null
@@ -1 +0,0 @@
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diff --git a/src/test/resources/org/bitcoinj/core/dogecoin_block748634.bin b/src/test/resources/org/bitcoinj/core/dogecoin_block748634.bin
new file mode 100644
index 00000000..d2a2256f
Binary files /dev/null and b/src/test/resources/org/bitcoinj/core/dogecoin_block748634.bin differ
diff --git a/src/test/resources/org/bitcoinj/core/dogecoin_block894863.hex b/src/test/resources/org/bitcoinj/core/dogecoin_block894863.hex
deleted file mode 100644
index c06ca50e..00000000
--- a/src/test/resources/org/bitcoinj/core/dogecoin_block894863.hex
+++ /dev/null
@@ -1 +0,0 @@
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\ No newline at end of file