diff --git a/src/corelib/kernel/qdeadlinetimer.cpp b/src/corelib/kernel/qdeadlinetimer.cpp
index 4e15b3b80f8..731ff4e9e11 100644
--- a/src/corelib/kernel/qdeadlinetimer.cpp
+++ b/src/corelib/kernel/qdeadlinetimer.cpp
@@ -131,10 +131,12 @@ static qint64 add_saturate(qint64 t1, Duration1 dur, Durations... extra)
 */
 
 /*!
+    \fn QDeadlineTimer::QDeadlineTimer()
     \fn QDeadlineTimer::QDeadlineTimer(Qt::TimerType timerType)
 
     Constructs an expired QDeadlineTimer object. For this object,
-    remainingTime() will return 0.
+    remainingTime() will return 0. If \a timerType is not set, then the object
+    will use the \l{Qt::CoarseTimer}{coarse} \l{QDeadlineTimer#Timer types}{timer type}.
 
     The timer type \a timerType may be ignored, since the timer is already
     expired. Similarly, for optimization purposes, this function will not
diff --git a/src/corelib/kernel/qdeadlinetimer.h b/src/corelib/kernel/qdeadlinetimer.h
index b872422add0..57c771de9a2 100644
--- a/src/corelib/kernel/qdeadlinetimer.h
+++ b/src/corelib/kernel/qdeadlinetimer.h
@@ -26,7 +26,8 @@ public:
     enum class ForeverConstant { Forever };
     static constexpr ForeverConstant Forever = ForeverConstant::Forever;
 
-    constexpr QDeadlineTimer(Qt::TimerType type_ = Qt::CoarseTimer) noexcept
+    constexpr QDeadlineTimer() noexcept = default;
+    constexpr explicit QDeadlineTimer(Qt::TimerType type_) noexcept
         : type(type_) {}
     constexpr QDeadlineTimer(ForeverConstant, Qt::TimerType type_ = Qt::CoarseTimer) noexcept
         : t1((std::numeric_limits<qint64>::max)()), type(type_) {}
@@ -142,7 +143,7 @@ private:
 #if QT_VERSION < QT_VERSION_CHECK(7, 0, 0)
     unsigned t2 = 0;
 #endif
-    unsigned type;
+    unsigned type = Qt::CoarseTimer;
 
     qint64 rawRemainingTimeNSecs() const noexcept;
 };