diff --git a/src/main/java/htsjdk/variant/vcf/VCFStandardHeaderLines.java b/src/main/java/htsjdk/variant/vcf/VCFStandardHeaderLines.java
index dfb3f0f0e..dd5551efb 100644
--- a/src/main/java/htsjdk/variant/vcf/VCFStandardHeaderLines.java
+++ b/src/main/java/htsjdk/variant/vcf/VCFStandardHeaderLines.java
@@ -184,7 +184,7 @@ private static void registerStandard(final VCFInfoHeaderLine line) {
         registerStandard(new VCFFormatHeaderLine(VCFConstants.DEPTH_KEY, 1, VCFHeaderLineType.Integer, "Approximate read depth (reads with MQ=255 or with bad mates are filtered)"));
         registerStandard(new VCFFormatHeaderLine(VCFConstants.GENOTYPE_PL_KEY, VCFHeaderLineCount.G, VCFHeaderLineType.Integer, "Normalized, Phred-scaled likelihoods for genotypes as defined in the VCF specification"));
         registerStandard(new VCFFormatHeaderLine(VCFConstants.GENOTYPE_ALLELE_DEPTHS, VCFHeaderLineCount.R, VCFHeaderLineType.Integer, "Allelic depths for the ref and alt alleles in the order listed"));
-        registerStandard(new VCFFormatHeaderLine(VCFConstants.GENOTYPE_FILTER_KEY, 1, VCFHeaderLineType.String, "Genotype-level filter"));
+        registerStandard(new VCFFormatHeaderLine(VCFConstants.GENOTYPE_FILTER_KEY, VCFHeaderLineCount.UNBOUNDED, VCFHeaderLineType.String, "Genotype-level filter"));
         registerStandard(new VCFFormatHeaderLine(VCFConstants.PHASE_QUALITY_KEY, 1, VCFHeaderLineType.Float, "Read-backed phasing quality"));
 
         // INFO lines