diff --git a/gatk.wdl b/gatk.wdl
index d54277b76508db817427f9f9ff3a46019948765c..18829f1c3a8a0bc1ad7bd751018b64d2a577cbfa 100644
--- a/gatk.wdl
+++ b/gatk.wdl
@@ -128,7 +128,6 @@ task CombineGVCFs {
 
         if [ ${length(gvcfFiles)} -gt 1 ]; then
             ${toolCommand} \
-            -Xmx${mem}G -jar ${gatkJar} \
              CombineGVCFs \
              -R ${refFasta} \
              -O ${outputPath} \