diff --git a/silentdragon.pro b/silentdragon.pro
index 4e09bc3..ba7b651 100644
--- a/silentdragon.pro
+++ b/silentdragon.pro
@@ -129,7 +129,7 @@ TRANSLATIONS = res/silentdragon_bg.ts \
                res/silentdragon_zh.ts
 
 include(singleapplication/singleapplication.pri)
-DEFINES += QAPPLICATION_CLASS=QApplication
+DEFINES += QAPPLICATION_CLASS=QApplication _FORTIFY_SOURCE=2
 
 QMAKE_INFO_PLIST = res/Info.plist