diff --git a/sign.assembly.ps1 b/sign.assembly.ps1
index 2b58ece3..eecb4283 100644
--- a/sign.assembly.ps1
+++ b/sign.assembly.ps1
@@ -3,12 +3,12 @@ if ($env:CI -eq "true") {
 }
 
 $cert = Get-ChildItem -Path Cert:\CurrentUser\My -CodeSigningCert | Select-Object -First 1
-if ($cert -eq $null) {
+if ($null -eq $cert) {
     Write-Host "No code signing certificate found in MY store. Exit."
     exit 1
 }
 
-$signtool = Get-ChildItem -Path "C:\Program Files (x86)\Windows Kits" -Recurse -Filter "signtool.exe" | Select-Object -First 1 -ExpandProperty FullName
+$signtool = Get-ChildItem -Path "${env:ProgramFiles(x86)}\Windows Kits" -Recurse -Filter "signtool.exe" | Select-Object -First 1 -ExpandProperty FullName
 Write-host "Signtool path: $signtool"
 if (Test-Path $signtool) {
     Write-Output "sign the assembly"
diff --git a/sign3.ps1 b/sign3.ps1
index ca419390..17a9acc5 100644
--- a/sign3.ps1
+++ b/sign3.ps1
@@ -2,7 +2,7 @@ if ($env:CI -eq "true") {
     exit 0
 }
 
-$signtool = Get-ChildItem -Path "C:\Program Files (x86)\Windows Kits" -Recurse -Filter "signtool.exe" | Select-Object -First 1 -ExpandProperty FullName
+$signtool = Get-ChildItem -Path "${env:ProgramFiles(x86)}\Windows Kits" -Recurse -Filter "signtool.exe" | Select-Object -First 1 -ExpandProperty FullName
 Write-host "Signtool path: $signtool"
 if (Test-Path $signtool) {
     New-Item -ItemType Directory -Path ".\SharpSnmpLib\bin\Release" -Force | Out-Null