diff --git a/tools/auto-tester/src/TestRunner.cpp b/tools/auto-tester/src/TestRunner.cpp
index 4ceb812905..6e03850c88 100644
--- a/tools/auto-tester/src/TestRunner.cpp
+++ b/tools/auto-tester/src/TestRunner.cpp
@@ -532,7 +532,7 @@ void TestRunner::parseBuildInformation() {
         QString platformOfInterest;
 #ifdef Q_OS_WIN
         platformOfInterest = "windows";
-#elif Q_OS_MAC
+#elif defined(Q_OS_MAC)
         platformOfInterest = "mac";
 #endif
         QDomElement element = domDocument.documentElement();