diff --git a/src/corelib/tools/qdatetime.cpp b/src/corelib/tools/qdatetime.cpp
index d2064b3e84..1343600369 100644
--- a/src/corelib/tools/qdatetime.cpp
+++ b/src/corelib/tools/qdatetime.cpp
@@ -1854,6 +1854,8 @@ QTime fromStringImpl(const QString &s, Qt::DateFormat f, bool &isMidnight24)
         return QTime(hour, minute, second, qMin(qRound(msec * 1000.0), 999));
     }
     }
+    Q_UNREACHABLE();
+    return QTime();
 }
 }