diff --git a/jhdf/src/main/java/io/jhdf/dataset/chunked/indexing/FixedArrayIndex.java b/jhdf/src/main/java/io/jhdf/dataset/chunked/indexing/FixedArrayIndex.java
index 6947e956..8199bf91 100644
--- a/jhdf/src/main/java/io/jhdf/dataset/chunked/indexing/FixedArrayIndex.java
+++ b/jhdf/src/main/java/io/jhdf/dataset/chunked/indexing/FixedArrayIndex.java
@@ -150,7 +150,7 @@ private FixedArrayDataBlock(FixedArrayIndex fixedArrayIndex, HdfBackingStorage h
 						}
 					} else if (clientId == 1) { // Filtered
 						for (int i = 0; i < pageSize; i++) {
-							readFiltered(fixedArrayIndex, hdfBackingStorage, bb, i);
+							readFiltered(fixedArrayIndex, hdfBackingStorage, bb, chunkIndex++);
 						}
 					} else {
 						throw new HdfException("Unrecognized client ID  = " + clientId);