diff --git a/tools/build.bat b/tools/build.bat
index 47bf53c9..712c0e85 100755
--- a/tools/build.bat
+++ b/tools/build.bat
@@ -64,6 +64,8 @@ if X%SignedPackage%==X (
     echo driver-x86.inf >>driver.ddf
     echo winfsp-x86.sys >>driver.ddf
     makecab /F driver.ddf
+    signtool sign /ac %CrossCert% /i %Issuer% /n %Subject% /t http://timestamp.digicert.com driver.cab
+    if errorlevel 1 set /a signfail=signfail+1
     popd
 )