diff --git a/src/support/Systemcall.cpp b/src/support/Systemcall.cpp
index ec3f5a2258..281d6d871f 100644
--- a/src/support/Systemcall.cpp
+++ b/src/support/Systemcall.cpp
@@ -60,7 +60,7 @@ int Systemcall::startscript(Starttype how, string const & what)
 #else
 	QString cmd = QString::fromLocal8Bit(what.c_str());
 	QProcess * process = new QProcess;
-#ifndef WIN32
+#ifndef _WIN32
 	if (isatty(1))
 		process->setStandardOutputFile(toqstr("/dev/stdout"));
 	if (isatty(2))
@@ -92,7 +92,7 @@ int Systemcall::startscript(Starttype how, string const & what)
 		LYXERR0("state " << process->state());
 		LYXERR0("status " << process->exitStatus());
 	}
-#ifdef WIN32
+#ifdef _WIN32
 	cout << fromqstr(QString::fromLocal8Bit(process->readAllStandardOutput().data())) << endl;
 	cerr << fromqstr(QString::fromLocal8Bit(process->readAllStandardError().data())) << endl;
 #endif