diff --git a/circle.yml b/circle.yml
index 9b72948..3486553 100644
--- a/circle.yml
+++ b/circle.yml
@@ -1,6 +1,8 @@
 machine:
   java:
     version: oraclejdk8
+  environment:
+    _JAVA_OPTIONS: "-Xms512m -Xmx2048m"
 
 dependencies:
   pre: