diff --git a/common.ant.xml b/common.ant.xml
index 8a65f84..358f879 100755
--- a/common.ant.xml
+++ b/common.ant.xml
@@ -161,7 +161,7 @@
       <echo message="${javac.out} ${javac.junit.out}" />
       <junit dir="@{test.out}" fork="yes" printsummary="yes" failureproperty="junit.failure" >
         <jvmarg line="${junit.platform.args}" />
-        <jvmarg line="-Xmx512m" />
+        <jvmarg line="-Xmx768m" />
         <sysproperty key="gwt.args" value="${junit.notheadless.arg} @{test.args}" />
         <sysproperty key="java.awt.headless" value="${junit.headless}" />
         <sysproperty key="gwt.devjar" value="${gwt.dev.staging.jar}" />