diff --git a/.rultor.yml b/.rultor.yml
index 38da872645..9936efe0fb 100644
--- a/.rultor.yml
+++ b/.rultor.yml
@@ -38,6 +38,7 @@ install: |
   gem install pdd
   gem install texsc:0.6.0
   gem install texqc:0.6.0
+  export JAVA_OPTS="-Xmx4g"
 merge:
   script: |
     mvn clean install -Pqulice --errors -Dstyle.color=never