diff --git a/tests/modules/gatk4/markduplicatesspark/test.yml b/tests/modules/gatk4/markduplicatesspark/test.yml
index 5ee751c4..25c8ec38 100644
--- a/tests/modules/gatk4/markduplicatesspark/test.yml
+++ b/tests/modules/gatk4/markduplicatesspark/test.yml
@@ -25,4 +25,4 @@
     - path: output/gatk4/test.bam
       md5sum: 898cb0a6616897d8ada90bab53bf0837
     - path: output/gatk4/test.metrics
-      contains: "## METRICS CLASS	org.broadinstitute.hellbender.utils.read.markduplicates.GATKDuplicationMetrics"
+      contains: '[ ## METRICS CLASS	org.broadinstitute.hellbender.utils.read.markduplicates.GATKDuplicationMetrics ]'