diff --git a/public/Import-DbaParquet.ps1 b/public/Import-DbaParquet.ps1
index a49d5b8c4a1..5be72f99e24 100644
--- a/public/Import-DbaParquet.ps1
+++ b/public/Import-DbaParquet.ps1
@@ -320,7 +320,12 @@ function Import-DbaParquet {
             param([string]$Path)
             $stream = [System.IO.File]::OpenRead($Path)
             try {
-                $reader = [Parquet.ParquetReader]::CreateAsync($stream).GetAwaiter().GetResult()
+                # leaveStreamOpen has to be passed as false. It defaults to true, which means disposing the
+                # reader leaves the file stream open and the file stays locked until the garbage collector
+                # finalizes it - so the imported file could not be deleted or overwritten for an arbitrary
+                # time after the import finished. All four arguments are passed because the overload that
+                # takes a stream can only be selected by its full signature.
+                $reader = [Parquet.ParquetReader]::CreateAsync($stream, $null, $false, [System.Threading.CancellationToken]::None).GetAwaiter().GetResult()
                 return $reader
             } catch {
                 $stream.Dispose()