diff --git a/windows/clone-pull-request.ps1 b/windows/clone-pull-request.ps1
index 6941ee1..3d2f44a 100644
--- a/windows/clone-pull-request.ps1
+++ b/windows/clone-pull-request.ps1
@@ -1,7 +1,7 @@
 
 Set-Variable -Name "FLAGS" -Value ""
 if ($Env:PLUGIN_DEPTH) {
-    Set-Variable -Name "FLAGS" -Value "--depth=$Env:PLUGIN_DEPTH" 
+    Set-Variable -Name "FLAGS" -Value "--depth=$Env:PLUGIN_DEPTH"
 }
 
 if (!(Test-Path .git)) {
@@ -12,5 +12,5 @@ if (!(Test-Path .git)) {
 git fetch $FLAGS origin "+refs/heads/${Env:DRONE_COMMIT_BRANCH}:"
 git checkout $Env:DRONE_COMMIT_BRANCH
 
-git fetch origin $Env:DRONE_COMMIT_REF:
+git fetch origin "${Env:DRONE_COMMIT_REF}:"
 git rebase $Env:DRONE_COMMIT_SHA