diff --git a/src/corelib/thread/qwaitcondition_unix.cpp b/src/corelib/thread/qwaitcondition_unix.cpp
index c93328b4bc..0ba90763cf 100644
--- a/src/corelib/thread/qwaitcondition_unix.cpp
+++ b/src/corelib/thread/qwaitcondition_unix.cpp
@@ -204,7 +204,7 @@ void QWaitCondition::wakeAll()
 
 bool QWaitCondition::wait(QMutex *mutex, unsigned long time)
 {
-    if (quint64(time) > quint64(std::numeric_limits<qint64>::max()))
+    if (time == std::numeric_limits<unsigned long>::max())
         return wait(mutex, QDeadlineTimer(QDeadlineTimer::Forever));
     return wait(mutex, QDeadlineTimer(time));
 }
@@ -231,6 +231,8 @@ bool QWaitCondition::wait(QMutex *mutex, QDeadlineTimer deadline)
 
 bool QWaitCondition::wait(QReadWriteLock *readWriteLock, unsigned long time)
 {
+    if (time == std::numeric_limits<unsigned long>::max())
+        return wait(readWriteLock, QDeadlineTimer(QDeadlineTimer::Forever));
     return wait(readWriteLock, QDeadlineTimer(time));
 }