diff --git a/lib/ansible/modules/windows/setup.ps1 b/lib/ansible/modules/windows/setup.ps1
index 06c160fa28..a6f439d733 100644
--- a/lib/ansible/modules/windows/setup.ps1
+++ b/lib/ansible/modules/windows/setup.ps1
@@ -80,6 +80,7 @@ $winrm_https_listener_parent_path = Get-ChildItem -Path WSMan:\localhost\Listene
 $winrm_https_listener_path = $null
 $https_listener = $null
 $winrm_cert_thumbprint = $null
+$uppercase_cert_thumbprint = $null
 
 if ($winrm_https_listener_parent_path ) {
     $winrm_https_listener_path = $winrm_https_listener_parent_path.PSParentPath.Substring($winrm_https_listener_parent_path.PSParentPath.LastIndexOf("\"))