diff --git a/tests/modules/gatk4/genotypegvcfs/main.nf b/tests/modules/gatk4/genotypegvcfs/main.nf
index 4caba697..cd7d3a03 100644
--- a/tests/modules/gatk4/genotypegvcfs/main.nf
+++ b/tests/modules/gatk4/genotypegvcfs/main.nf
@@ -82,7 +82,8 @@ workflow test_gatk4_genotypegvcfs_gz_input_dbsnp_intervals {
     input = [ [ id:'test' ], // meta map
             file(params.test_data['homo_sapiens']['illumina']['test_genome_vcf_gz'], checkIfExists: true),
             file(params.test_data['homo_sapiens']['illumina']['test_genome_vcf_gz_tbi'], checkIfExists: true),
-            file(params.test_data['homo_sapiens']['genome']['genome_bed'], checkIfExists: true)
+            file(params.test_data['homo_sapiens']['genome']['genome_bed'], checkIfExists: true),
+            []
         ]
 
     fasta = file(params.test_data['homo_sapiens']['genome']['genome_fasta'], checkIfExists: true)
@@ -108,6 +109,7 @@ workflow test_gatk4_genotypegvcfs_gendb_input {
     gendb = UNTAR.out.untar.map{ it[1] }.collect()
     gendb.add([])
     gendb.add([])
+    gendb.add([])
 
     input = Channel.of([ id:'test' ]).combine(gendb)
 
@@ -130,6 +132,7 @@ workflow test_gatk4_genotypegvcfs_gendb_input_dbsnp {
     gendb = UNTAR.out.untar.map{ it[1] }.collect()
     gendb.add([])
     gendb.add([])
+    gendb.add([])
     input = Channel.of([ id:'test' ]).combine(gendb)
 
     GATK4_GENOTYPEGVCFS ( input, fasta, fai, dict, dbsnp, dbsnp_tbi)
@@ -148,6 +151,8 @@ workflow test_gatk4_genotypegvcfs_gendb_input_intervals {
     gendb = UNTAR.out.untar.map{ it[1] }.collect()
     gendb.add([])
     gendb.add([file(params.test_data['homo_sapiens']['genome']['genome_bed'], checkIfExists: true)])
+    gendb.add([])
+
     input = Channel.of([ id:'test' ]).combine(gendb)
 
     GATK4_GENOTYPEGVCFS ( input, fasta, fai, dict, [], [] )
@@ -169,6 +174,8 @@ workflow test_gatk4_genotypegvcfs_gendb_input_dbsnp_intervals {
     gendb = UNTAR.out.untar.map{ it[1] }.collect()
     gendb.add([])
     gendb.add([file(params.test_data['homo_sapiens']['genome']['genome_bed'], checkIfExists: true)])
+    gendb.add([])
+
     input = Channel.of([ id:'test' ]).combine(gendb)
 
     GATK4_GENOTYPEGVCFS ( input, fasta, fai, dict, dbsnp, dbsnp_tbi )