diff --git a/src/main/java/org/codehaus/mojo/gwt/shell/AbstractGwtShellMojo.java b/src/main/java/org/codehaus/mojo/gwt/shell/AbstractGwtShellMojo.java
index de1cee02..49ecdaff 100644
--- a/src/main/java/org/codehaus/mojo/gwt/shell/AbstractGwtShellMojo.java
+++ b/src/main/java/org/codehaus/mojo/gwt/shell/AbstractGwtShellMojo.java
@@ -101,13 +101,13 @@ public abstract class AbstractGwtShellMojo
 
     /**
      * Extra JVM arguments that are passed to the GWT-Maven generated scripts (for compiler, shell, etc - typically use
-     * -Xmx512m here, or -XstartOnFirstThread, etc).
+     * -Xmx2G here, or -XstartOnFirstThread, etc).
      * <p>
      * Can be set from command line using '-Dgwt.extraJvmArgs=...', defaults to setting max Heap size to be large enough
      * for most GWT use cases.
      * </p>
      */
-    @Parameter(property = "gwt.extraJvmArgs", defaultValue="-Xmx512m")
+    @Parameter(property = "gwt.extraJvmArgs", defaultValue="-Xmx1G")
     private String extraJvmArgs;
 
     /**