diff --git a/src/corelib/time/qdatetime.cpp b/src/corelib/time/qdatetime.cpp
index 9638c5b5e8..9690c8c66b 100644
--- a/src/corelib/time/qdatetime.cpp
+++ b/src/corelib/time/qdatetime.cpp
@@ -1227,9 +1227,10 @@ QDate QDate::addDays(qint64 ndays) const
     if (isNull())
         return QDate();
 
-    // Due to limits on minJd() and maxJd() we know that any overflow
-    // will be invalid and caught by fromJulianDay().
-    return fromJulianDay(jd + ndays);
+    if (qint64 r; Q_UNLIKELY(qAddOverflow(jd, ndays, &r)))
+        return QDate();
+    else
+        return fromJulianDay(r);
 }
 
 /*!