diff --git a/build/windows/config-cmd.xml b/build/windows/config-cmd.xml
index 607d545c5..7cd313d08 100755
--- a/build/windows/config-cmd.xml
+++ b/build/windows/config-cmd.xml
@@ -35,7 +35,7 @@
     <!-- for 2.2, set a minimum version -->
     <minVersion>1.7.0_40</minVersion>
     <!-- increase available per PDE X request -->
-    <maxHeapSize>256</maxHeapSize>
+    <maxHeapSize>256m</maxHeapSize>
   </jre>
   <messages>
     <startupErr>An error occurred while starting the application.</startupErr>
diff --git a/build/windows/config.xml b/build/windows/config.xml
index 1ff09ff00..197e63680 100755
--- a/build/windows/config.xml
+++ b/build/windows/config.xml
@@ -35,7 +35,7 @@
     <!-- for 2.2, set a minimum version -->
     <minVersion>1.7.0_40</minVersion>
     <!-- increase available per PDE X request -->
-    <maxHeapSize>256</maxHeapSize>
+    <maxHeapSize>256m</maxHeapSize>
   </jre>
   <splash>
     <file>about.bmp</file>