diff --git a/tools/picard/picard_CollectAlignmentSummaryMetrics.xml b/tools/picard/picard_CollectAlignmentSummaryMetrics.xml
index df838ee1b53..ff277fad181 100644
--- a/tools/picard/picard_CollectAlignmentSummaryMetrics.xml
+++ b/tools/picard/picard_CollectAlignmentSummaryMetrics.xml
@@ -77,7 +77,9 @@
     <test>
       <param name="bisulphite" value="false" />
       <param name="assume_sorted" value="true" />
-      <param name="adapters" value="" />
+      <repeat name="adapters">
+        <param name="adapter" value = ""/>
+      </repeat>
       <param name="maxinsert" value="100000" />
       <param name="reference_source_selector" value="history" />
       <param name="ref_file" value="picard_CASM_ref.fa" />