diff --git a/gatk.wdl b/gatk.wdl
index 18829f1c3a8a0bc1ad7bd751018b64d2a577cbfa..300c2d40f056218be27fe85d31dcb7e017a28e15 100644
--- a/gatk.wdl
+++ b/gatk.wdl
@@ -215,7 +215,6 @@ task GenotypeGVCFs {
         ${preCommand}
 
         ${toolCommand} \
-        -Xmx${mem}G -jar ${gatkJar} \
          GenotypeGVCFs \
          -R ${refFasta} \
          -O ${outputPath} \
@@ -266,7 +265,6 @@ task HaplotypeCallerGvcf {
         set -e -o pipefail
         ${preCommand}
         ${toolCommand} \
-        -Xmx${mem}G -jar ${gatkJar} \
           HaplotypeCaller \
           -R ${refFasta} \
           -O ${gvcfPath} \