diff --git a/src/WINNT/install/NSIS/OpenAFS.nsi b/src/WINNT/install/NSIS/OpenAFS.nsi
index f1c143aa52..95942c823a 100644
--- a/src/WINNT/install/NSIS/OpenAFS.nsi
+++ b/src/WINNT/install/NSIS/OpenAFS.nsi
@@ -740,7 +740,7 @@ skipremove:
   WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "UseDNS" $R0
   WriteRegStr HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "NetbiosName" "AFS"
   WriteRegStr HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "MountRoot" "/afs"
-  WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "RxMaxMTU" 1260
+  WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "RxMaxMTU" 0
   WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "IsGateway" 0
   WriteRegDWORD HKLM "SYSTEM\CurrentControlSet\Services\TransarcAFSDaemon\Parameters" "HideDotFiles" 1
 
diff --git a/src/WINNT/install/wix/config.wxi b/src/WINNT/install/wix/config.wxi
index 94d9ed8069..4c5b3e0fbf 100644
--- a/src/WINNT/install/wix/config.wxi
+++ b/src/WINNT/install/wix/config.wxi
@@ -57,7 +57,7 @@
 		<?define NetbiosName="AFS"?>
     <?endif?>
     <?ifndef RxMaxMTU?>
-		<?define RxMaxMTU="1260"?>
+		<?define RxMaxMTU="0"?>
     <?endif?>
     <?ifndef HideDotFiles?>
 		<?define HideDotFiles="1"?>