Index: wp-admin/network.php
===================================================================
--- wp-admin/network.php	(revision 18999)
+++ wp-admin/network.php	(working copy)
@@ -455,7 +455,7 @@
                 </rule>
                 <rule name="WordPress Rule 5" stopProcessing="true">
                     <match url="^[_0-9a-zA-Z-]+/(wp-(content|admin|includes).*)" ignoreCase="false" />
-                    <action type="Rewrite" url="{R:2}" />
+                    <action type="Rewrite" url="{R:1}" />
                 </rule>
                 <rule name="WordPress Rule 6" stopProcessing="true">
                     <match url="^([_0-9a-zA-Z-]+/)?(.*\.php)$" ignoreCase="false" />
Index: wp-includes/rewrite.php
===================================================================
--- wp-includes/rewrite.php	(revision 18999)
+++ wp-includes/rewrite.php	(working copy)
@@ -1739,7 +1739,7 @@
 				</rule>
 				<rule name="wordpress - Rule 5" stopProcessing="true">
 					<match url="^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*)" ignoreCase="false" />
-					<action type="Rewrite" url="{R:2}" />
+					<action type="Rewrite" url="{R:1}" />
 				</rule>
 				<rule name="wordpress - Rule 6" stopProcessing="true">
 					<match url="^([_0-9a-zA-Z-]+/)?(.*\.php)$" ignoreCase="false" />