diff --git a/public/java/src/org/broadinstitute/sting/utils/codecs/bcf2/BCF2Codec.java b/public/java/src/org/broadinstitute/sting/utils/codecs/bcf2/BCF2Codec.java
index 5456d47ed..5915c9914 100644
--- a/public/java/src/org/broadinstitute/sting/utils/codecs/bcf2/BCF2Codec.java
+++ b/public/java/src/org/broadinstitute/sting/utils/codecs/bcf2/BCF2Codec.java
@@ -208,9 +208,9 @@ public class BCF2Codec implements FeatureCodec<VariantContext>, ReferenceDepende
         final int nAlleleInfo = decoder.decodeInt(BCF2Type.INT32);
         final int nFormatSamples = decoder.decodeInt(BCF2Type.INT32);
         final int nAlleles = nAlleleInfo >> 16;
-        final int nInfo = nAlleleInfo & 0x00FF;
-        final int nFormatFields = nFormatSamples >>  24;
-        final int nSamples = nFormatSamples & 0x0FFF;
+        final int nInfo = nAlleleInfo & 0x0000FFFF;
+        final int nFormatFields = nFormatSamples >> 24;
+        final int nSamples = nFormatSamples & 0x00FFFFF;
 
         decodeID(builder);
         final ArrayList<Allele> alleles = decodeAlleles(builder, pos, nAlleles);
diff --git a/public/java/src/org/broadinstitute/sting/utils/variantcontext/writer/BCF2Writer.java b/public/java/src/org/broadinstitute/sting/utils/variantcontext/writer/BCF2Writer.java
index 41621f66e..64f901451 100644
--- a/public/java/src/org/broadinstitute/sting/utils/variantcontext/writer/BCF2Writer.java
+++ b/public/java/src/org/broadinstitute/sting/utils/variantcontext/writer/BCF2Writer.java
@@ -169,8 +169,8 @@ class BCF2Writer extends IndexingVariantContextWriter {
         final int nGenotypeFormatFields = getNGenotypeFormatFields(vc);
         final int nSamples = vc.getNSamples();
 
-        encoder.encodeRawInt((nAlleles << 16) | (nInfo & 0x00FF), BCF2Type.INT32);
-        encoder.encodeRawInt((nGenotypeFormatFields << 24) | (nSamples & 0x0FFF), BCF2Type.INT32);
+        encoder.encodeRawInt((nAlleles << 16) | (nInfo & 0x0000FFFF), BCF2Type.INT32);
+        encoder.encodeRawInt((nGenotypeFormatFields << 24) | (nSamples & 0x00FFFFF), BCF2Type.INT32);
 
         buildID(vc);
         buildAlleles(vc);