diff --git a/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/bloom/BloomIndexType.java b/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/bloom/BloomIndexType.java
index 945430d327d7..ee1b6bc6a6a0 100644
--- a/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/bloom/BloomIndexType.java
+++ b/pinot-segment-local/src/main/java/org/apache/pinot/segment/local/segment/index/bloom/BloomIndexType.java
@@ -28,7 +28,6 @@
 import org.apache.pinot.segment.local.segment.index.loader.bloomfilter.BloomFilterHandler;
 import org.apache.pinot.segment.local.segment.index.readers.bloom.BloomFilterReaderFactory;
 import org.apache.pinot.segment.spi.ColumnMetadata;
-import org.apache.pinot.segment.spi.Constants;
 import org.apache.pinot.segment.spi.V1Constants;
 import org.apache.pinot.segment.spi.creator.IndexCreationContext;
 import org.apache.pinot.segment.spi.index.AbstractIndexType;
@@ -99,7 +98,7 @@ protected ColumnConfigDeserializer<BloomFilterConfig> createDeserializerForLegac
   @Override
   public BloomFilterCreator createIndexCreator(IndexCreationContext context, BloomFilterConfig indexConfig) {
     int cardinality = context.getCardinality();
-    if (cardinality == Constants.UNKNOWN_CARDINALITY) {
+    if (cardinality < 0) {
       // This is when we're creating bloom filters for non dictionary encoded cols where exact cardinality is not
       // known beforehand.
       // Since this field is only used for the estimate cardinality, using total # of entries instead
diff --git a/pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/Constants.java b/pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/Constants.java
index 911bde9a421e..b128f1923784 100644
--- a/pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/Constants.java
+++ b/pinot-segment-spi/src/main/java/org/apache/pinot/segment/spi/Constants.java
@@ -23,6 +23,9 @@ private Constants() {
   }
 
   public static final int EOF = Integer.MIN_VALUE;
+
+  // TODO: Consider modifying it to -1 to be more readable when stored in segment metadata. Reader accepts all negative
+  //       values as unknown in release 1.6.0. Change writer side after 1.6.0 release.
   public static final int UNKNOWN_CARDINALITY = Integer.MIN_VALUE;
 
   public static final String HLL_LOG2M_KEY = "log2m";