diff --git a/build.xml b/build.xml
index d2adc9f89..01012f185 100644
--- a/build.xml
+++ b/build.xml
@@ -145,7 +145,7 @@ PROPERTIES
 
   <property
       name="scalacfork.jvmargs"
-      value="-Xms512M -Xmx512M -Xss1M -XX:MaxPermSize=128M"/>
+      value="-Xms512M -Xmx768M -Xss1M -XX:MaxPermSize=128M"/>
 
   <property name="javac.cmd" value="${env.JAVA_HOME}/bin/javac"/>