diff --git a/src/gui/util/qgridlayoutengine_p.h b/src/gui/util/qgridlayoutengine_p.h
index e00c2c5e483..159e4a5a25a 100644
--- a/src/gui/util/qgridlayoutengine_p.h
+++ b/src/gui/util/qgridlayoutengine_p.h
@@ -72,12 +72,14 @@ class QHVContainer {
 
     static_assert(Qt::Horizontal == 0x1);
     static_assert(Qt::Vertical == 0x2);
-    static constexpr int map(Qt::Orientation o) noexcept
+    static constexpr int map(Qt::Orientation o)
     {
+        Q_ASSERT(o == Qt::Horizontal || o == Qt::Vertical); // Q_PRE
         return int(o) - 1;
     }
-    static constexpr int mapOther(Qt::Orientation o) noexcept
+    static constexpr int mapOther(Qt::Orientation o)
     {
+        Q_ASSERT(o == Qt::Horizontal || o == Qt::Vertical); // Q_PRE
         return 2 - int(o);
     }
 public:
@@ -86,11 +88,11 @@ public:
         : m_data{h, v} {}
     QHVContainer() = default;
 
-    constexpr T &operator[](Qt::Orientation o) noexcept { return m_data[map(o)]; }
-    constexpr const T &operator[](Qt::Orientation o) const noexcept { return m_data[map(o)]; }
+    constexpr T &operator[](Qt::Orientation o) { return m_data[map(o)]; }
+    constexpr const T &operator[](Qt::Orientation o) const { return m_data[map(o)]; }
 
-    constexpr T &other(Qt::Orientation o) noexcept { return m_data[mapOther(o)]; }
-    constexpr const T &other(Qt::Orientation o) const noexcept { return m_data[mapOther(o)]; }
+    constexpr T &other(Qt::Orientation o) { return m_data[mapOther(o)]; }
+    constexpr const T &other(Qt::Orientation o) const { return m_data[mapOther(o)]; }
 
     constexpr void transpose() noexcept { qSwap(m_data[0], m_data[1]); }
     constexpr QHVContainer transposed() const