diff --git a/src/corelib/io/qdebug_p.h b/src/corelib/io/qdebug_p.h
index 9b048ae9ab9..732929e7215 100644
--- a/src/corelib/io/qdebug_p.h
+++ b/src/corelib/io/qdebug_p.h
@@ -52,6 +52,10 @@ static inline void formatQRect(QDebug &debug, const Rect &rect)
         const qint64 w = qint64(rect.right()) - rect.left() + 1;
         const qint64 h = qint64(rect.bottom()) - rect.top() + 1;
         debug << w << 'x' << h;
+
+        constexpr qint64 M = (std::numeric_limits<int>::max)();
+        if (w > M || h > M)
+            debug << " (oversized)";
     } else {
         debug << rect.width() << 'x' << rect.height();
     }
diff --git a/tests/auto/corelib/tools/qrect/tst_qrect.cpp b/tests/auto/corelib/tools/qrect/tst_qrect.cpp
index ebf1d1b38bd..d7312ffc322 100644
--- a/tests/auto/corelib/tools/qrect/tst_qrect.cpp
+++ b/tests/auto/corelib/tools/qrect/tst_qrect.cpp
@@ -4526,7 +4526,7 @@ void tst_QRect::debug()
 
     str.clear();
     debug << QRect(QPoint(INT_MIN, INT_MIN), QPoint(INT_MAX, INT_MAX));
-    QCOMPARE(str, "QRect(-2147483648,-2147483648 4294967296x4294967296)");
+    QCOMPARE(str, "QRect(-2147483648,-2147483648 4294967296x4294967296 (oversized))");
 }
 
 QTEST_MAIN(tst_QRect)