diff --git a/biopet.wdl b/biopet.wdl
index d394bd586b108211da33720f4a6ea64cb854a95a..2868f0c2692b13dba51e1aad2dd64cb4470b9db0 100644
--- a/biopet.wdl
+++ b/biopet.wdl
@@ -62,7 +62,7 @@ task SampleConfig {
         set -e -o pipefail
         ${preCommand}
         mkdir -p . ${"$(dirname " + jsonOutputPath + ")"} ${"$(dirname " + tsvOutputPath + ")"}
-        java -jar ${tool_jar} \
+        java -Xmx2G -jar ${tool_jar} \
         -i ${sep="-i " inputFiles} \
         ${"--sample " + sample} \
         ${"--library " + library} \