diff --git a/azure-pipelines/download_install_qt.ps1 b/azure-pipelines/download_install_qt.ps1
index 37c820f6..6237c596 100644
--- a/azure-pipelines/download_install_qt.ps1
+++ b/azure-pipelines/download_install_qt.ps1
@@ -2,13 +2,13 @@ $ErrorActionPreference = "Stop"
 
 $qli_install_version = '2019.05.26.1'
 $qt_version = '5.13.0'
-$qli_path = $(Split-Path -Parent $PSCommandPath) + '\deps\qli-installer.zip'
+$qli_path = "$(Split-Path -Parent $PSCommandPath)\deps\qli-installer.zip"
 
 New-Item -Force -ItemType Directory -Path ".\deps\"
 
 Write-Output 'Downloading QLI Installer'
 $Wc = New-Object System.Net.WebClient
-$Wc.DownloadFile("https://github.com/nelsonjchen/qli-installer/archive/v$qli_install_version.zip", $qli_path) ;
+$Wc.DownloadFile("https://github.com/nelsonjchen/qli-installer/archive/v$qli_install_version.zip", "$qli_path") ;
 Write-Output 'Downloaded QLI Installer'
 
 Write-Output 'Extracting QLI Installer'