diff --git a/support/buildbot/bootstrap.pl b/support/buildbot/bootstrap.pl
index d8521565..0a96d544 100755
--- a/support/buildbot/bootstrap.pl
+++ b/support/buildbot/bootstrap.pl
@@ -32,7 +32,7 @@ if ($argn > 0 && $^O !~ /MSWin/) {
 	$result = `CC=$ARGV[0] CXX=$ARGV[0] python3 ../build/configure.py $conf_args`;
 } else {
 	if ($^O =~ /MSWin/) {
-		$result = `C:\\Python27\\Python.exe ..\\build\\configure.py $conf_args`;
+		$result = `C:\\Python38\\Python.exe ..\\build\\configure.py $conf_args`;
 	} else {
 		$result = `CC=clang CXX=clang python3 ../build/configure.py $conf_args`;
 	}
diff --git a/support/buildbot/startbuild.pl b/support/buildbot/startbuild.pl
index 42ec2b6f..6b17ddb9 100755
--- a/support/buildbot/startbuild.pl
+++ b/support/buildbot/startbuild.pl
@@ -15,7 +15,11 @@ if ($argn > 0) {
 	$ENV{CXX} = $ARGV[0];
 }
 
-system("ambuild --no-color 2>&1");
+if ($^O !~ /MSWin/) {
+	system("ambuild --no-color 2>&1");
+} else {
+	system("C:\\Python38\\scripts\\ambuild --no-color 2>&1");
+}
 
 if ($? != 0)
 {