diff --git a/windows/service-install.bat b/windows/service-install.bat
index 2fa7b134..7a1164ca 100755
--- a/windows/service-install.bat
+++ b/windows/service-install.bat
@@ -3,7 +3,7 @@
 setlocal EnableExtensions
 title DNSCrypt-Proxy
 
-whoami /groups | find "S-1-16-12288" >nul && goto :admin
+whoami /groups | findstr "S-1-16-12288" >nul && goto :admin
 if "%~1"=="RunAsAdmin" goto :error
 
 echo Requesting privileges elevation for managing the dnscrypt-proxy service . . .
diff --git a/windows/service-restart.bat b/windows/service-restart.bat
index b22d882c..4d7f598a 100755
--- a/windows/service-restart.bat
+++ b/windows/service-restart.bat
@@ -3,7 +3,7 @@
 setlocal EnableExtensions
 title DNSCrypt-Proxy
 
-whoami /groups | find "S-1-16-12288" >nul && goto :admin
+whoami /groups | findstr "S-1-16-12288" >nul && goto :admin
 if "%~1"=="RunAsAdmin" goto :error
 
 echo Requesting privileges elevation for managing the dnscrypt-proxy service . . .
diff --git a/windows/service-uninstall.bat b/windows/service-uninstall.bat
index c6c7b330..6580862f 100755
--- a/windows/service-uninstall.bat
+++ b/windows/service-uninstall.bat
@@ -3,7 +3,7 @@
 setlocal EnableExtensions
 title DNSCrypt-Proxy
 
-whoami /groups | find "S-1-16-12288" >nul && goto :admin
+whoami /groups | findstr "S-1-16-12288" >nul && goto :admin
 if "%~1"=="RunAsAdmin" goto :error
 
 echo Requesting privileges elevation for managing the dnscrypt-proxy service . . .