diff --git a/src/nf_modules/gatk4/main.nf b/src/nf_modules/gatk4/main.nf
index 737c1ea43daec71296067d4ee9eb0345dc8fca25..22efa0e0c0253f9f6a57db529d018c7978a93568 100644
--- a/src/nf_modules/gatk4/main.nf
+++ b/src/nf_modules/gatk4/main.nf
@@ -196,7 +196,7 @@ process gvcf_genotyping {
 gatk --java-options "-Xmx${xmx_memory}G" GenotypeGVCFs \
   -R ${fasta} \
   -V ${gvcf} \
-  -O ${bam.simpleName}_joint.vcf.gz
+  -O ${gvcf.simpleName}_joint.vcf.gz
 """
 }