diff --git a/src/corelib/global/qglobal.h b/src/corelib/global/qglobal.h
index 0828a3dac3..f3c3b7896d 100644
--- a/src/corelib/global/qglobal.h
+++ b/src/corelib/global/qglobal.h
@@ -896,6 +896,10 @@ inline void qUnused(T &x) { (void)x; }
 
 class QString;
 Q_CORE_EXPORT QString qt_error_string(int errorCode = -1);
+
+#ifndef Q_CC_MSVC
+Q_NORETURN
+#endif
 Q_CORE_EXPORT void qt_assert(const char *assertion, const char *file, int line);
 
 #if !defined(Q_ASSERT)
@@ -910,6 +914,9 @@ Q_CORE_EXPORT void qt_assert(const char *assertion, const char *file, int line);
 #define QT_NO_PAINT_DEBUG
 #endif
 
+#ifndef Q_CC_MSVC
+Q_NORETURN
+#endif
 Q_CORE_EXPORT void qt_assert_x(const char *where, const char *what, const char *file, int line);
 
 #if !defined(Q_ASSERT_X)
diff --git a/src/corelib/global/qlogging.cpp b/src/corelib/global/qlogging.cpp
index f30df92a54..81fe82a973 100644
--- a/src/corelib/global/qlogging.cpp
+++ b/src/corelib/global/qlogging.cpp
@@ -201,6 +201,9 @@ void QMessageLogger::fatal(const char *msg, ...)
     va_list ap;
     va_start(ap, msg); // use variable arg list
     qt_message(QtFatalMsg, context, msg, ap);
+#ifndef Q_CC_MSVC
+    Q_UNREACHABLE();
+#endif
     va_end(ap);
 }
 
diff --git a/src/corelib/global/qlogging.h b/src/corelib/global/qlogging.h
index 29313bd582..0860ef71b8 100644
--- a/src/corelib/global/qlogging.h
+++ b/src/corelib/global/qlogging.h
@@ -113,6 +113,10 @@ public:
     __attribute__ ((format (printf, 2, 3)))
 #endif
     ;
+
+#ifndef Q_CC_MSVC
+    Q_NORETURN
+#endif
     void fatal(const char *msg, ...)
 #if defined(Q_CC_GNU) && !defined(__INSURE__)
     __attribute__ ((format (printf, 2, 3)))