diff --git a/src/PythonQt.cpp b/src/PythonQt.cpp
index 7fd18ad..f97bdf1 100644
--- a/src/PythonQt.cpp
+++ b/src/PythonQt.cpp
@@ -149,7 +149,7 @@ PythonQt::PythonQt(int flags, const QByteArray& pythonQtModuleName)
 
   _p->_PythonQtObjectPtr_metaId = qRegisterMetaType<PythonQtObjectPtr>("PythonQtObjectPtr");
 
-  if (flags & PythonAlreadyInitialized == 0) {
+  if ((flags & PythonAlreadyInitialized) == 0) {
     Py_SetProgramName("PythonQt");
     if (flags & IgnoreSiteModule) {
       // this prevents the automatic importing of Python site files