diff --git a/indra/newview/viewer_manifest.py b/indra/newview/viewer_manifest.py
index 4e516db12114f3dc3da60383997bede619047ace..2aaa041eda32cdbe6a165fb5e6e46c071155c047 100755
--- a/indra/newview/viewer_manifest.py
+++ b/indra/newview/viewer_manifest.py
@@ -980,7 +980,7 @@ def package_finish(self):
         # make sure we don't have stale files laying about
         self.remove(sparsename, finalname)
 
-        self.run_command('hdiutil create %(sparse)r -volname %(vol)r -fs HFS+ -type SPARSE -megabytes 1500 -layout SPUD' % {
+        self.run_command('hdiutil create %(sparse)r -volname %(vol)r -fs HFS+ -type SPARSE -megabytes 1300 -layout SPUD' % {
                 'sparse':sparsename,
                 'vol':volname})