diff --git a/src/bin/dosh-client.rs b/src/bin/dosh-client.rs
index a611448..f37acf7 100644
--- a/src/bin/dosh-client.rs
+++ b/src/bin/dosh-client.rs
@@ -4811,10 +4811,10 @@ fn windows_deferred_update_script(parent_pid: u32, installer_script: &str) -> St
          $ProgressPreference='SilentlyContinue';\
          $parent=Get-Process -Id {parent_pid} -ErrorAction SilentlyContinue;\
          $parentStart=if ($parent) {{ $parent.StartTime }} else {{ $null }};\
-         while ($true) {{ \
+         while ($parentStart) {{ \
              $current=Get-Process -Id {parent_pid} -ErrorAction SilentlyContinue;\
              if (-not $current) {{ break }};\
-             if ($parentStart -and $current.StartTime -ne $parentStart) {{ break }};\
+             if ($current.StartTime -ne $parentStart) {{ break }};\
              Start-Sleep -Milliseconds 100 \
          }};\
          {installer_script}"
@@ -13180,12 +13180,11 @@ mod tests {
         assert!(
             deferred.contains("$parentStart=if ($parent) { $parent.StartTime } else { $null }")
         );
+        assert!(deferred.contains("while ($parentStart)"));
         assert!(deferred.contains("$current=Get-Process -Id 4242 -ErrorAction SilentlyContinue"));
         assert!(deferred.contains("if (-not $current) { break }"));
-        assert!(
-            deferred
-                .contains("if ($parentStart -and $current.StartTime -ne $parentStart) { break }")
-        );
+        assert!(deferred.contains("if ($current.StartTime -ne $parentStart) { break }"));
+        assert!(!deferred.contains("while ($true)"));
         assert!(deferred.contains("Start-Sleep -Milliseconds 100"));
         assert!(
             deferred.contains(