diff --git a/gatk.wdl b/gatk.wdl
index d54277b76508db817427f9f9ff3a46019948765c..d591626d012ed9d1709b0ecbc01664954b5ccc03 100644
--- a/gatk.wdl
+++ b/gatk.wdl
@@ -216,7 +216,6 @@ task GenotypeGVCFs {
         ${preCommand}
 
         ${toolCommand} \
-        -Xmx${mem}G -jar ${gatkJar} \
          GenotypeGVCFs \
          -R ${refFasta} \
          -O ${outputPath} \
@@ -267,7 +266,6 @@ task HaplotypeCallerGvcf {
         set -e -o pipefail
         ${preCommand}
         ${toolCommand} \
-        -Xmx${mem}G -jar ${gatkJar} \
           HaplotypeCaller \
           -R ${refFasta} \
           -O ${gvcfPath} \