diff --git a/contrib/automation/hgautomation/windows.py b/contrib/automation/hgautomation/windows.py
--- a/contrib/automation/hgautomation/windows.py
+++ b/contrib/automation/hgautomation/windows.py
@@ -39,7 +39,7 @@
 $Env:PATH = "${root}\VC\Bin;${root}\WinSDK\Bin;$Env:PATH"
 $Env:INCLUDE = "${root}\VC\Include;${root}\WinSDK\Include;$Env:INCLUDE"
 $Env:LIB = "${root}\VC\Lib;${root}\WinSDK\Lib;$Env:LIB"
-$Env:LIBPATH = "${root}\VC\lib;${root}\WinSDK\Lib:$Env:LIBPATH"
+$Env:LIBPATH = "${root}\VC\lib;${root}\WinSDK\Lib;$Env:LIBPATH"
 '''.lstrip()
 
 HG_PURGE = r'''