diff --git a/src/widgets/kernel/qsizepolicy.cpp b/src/widgets/kernel/qsizepolicy.cpp
index a03523d2af..b08a9abb1e 100644
--- a/src/widgets/kernel/qsizepolicy.cpp
+++ b/src/widgets/kernel/qsizepolicy.cpp
@@ -254,6 +254,11 @@ QSizePolicy::ControlType QSizePolicy::controlType() const
     \sa QStyle::layoutSpacing()
 */
 void QSizePolicy::setControlType(ControlType type)
+{
+    bits.ctype = toControlTypeFieldValue(type);
+}
+
+quint32 QSizePolicy::toControlTypeFieldValue(ControlType type) Q_DECL_NOTHROW
 {
     /*
         The control type is a flag type, with values 0x1, 0x2, 0x4, 0x8, 0x10,
@@ -271,10 +276,8 @@ void QSizePolicy::setControlType(ControlType type)
 
     int i = 0;
     while (true) {
-        if (type & (0x1 << i)) {
-            bits.ctype = i;
-            return;
-        }
+        if (type & (0x1 << i))
+            return i;
         ++i;
     }
 }
diff --git a/src/widgets/kernel/qsizepolicy.h b/src/widgets/kernel/qsizepolicy.h
index eceb08259e..83ce5853ab 100644
--- a/src/widgets/kernel/qsizepolicy.h
+++ b/src/widgets/kernel/qsizepolicy.h
@@ -119,12 +119,19 @@ public:
 
     QT_SIZEPOLICY_CONSTEXPR QSizePolicy() : data(0) { }
 
+#ifdef Q_COMPILER_UNIFORM_INIT
+    QT_SIZEPOLICY_CONSTEXPR QSizePolicy(Policy horizontal, Policy vertical, ControlType type = DefaultType)
+        : bits{0, 0, quint32(horizontal), quint32(vertical),
+               type == DefaultType ? 0 : toControlTypeFieldValue(type), 0, 0, 0}
+    {}
+#else
     QSizePolicy(Policy horizontal, Policy vertical, ControlType type = DefaultType)
         : data(0) {
         bits.horPolicy = horizontal;
         bits.verPolicy = vertical;
         setControlType(type);
     }
+#endif // uniform-init
     QT_SIZEPOLICY_CONSTEXPR Policy horizontalPolicy() const { return static_cast<Policy>(bits.horPolicy); }
     QT_SIZEPOLICY_CONSTEXPR Policy verticalPolicy() const { return static_cast<Policy>(bits.verPolicy); }
     ControlType controlType() const;
@@ -176,6 +183,8 @@ private:
     struct Bits;
     QT_SIZEPOLICY_CONSTEXPR explicit QSizePolicy(Bits b) Q_DECL_NOTHROW : bits(b) { }
 
+    static quint32 toControlTypeFieldValue(ControlType type) Q_DECL_NOTHROW;
+
     struct Bits {
         quint32 horStretch : 8;
         quint32 verStretch : 8;
diff --git a/tests/auto/widgets/kernel/qsizepolicy/tst_qsizepolicy.cpp b/tests/auto/widgets/kernel/qsizepolicy/tst_qsizepolicy.cpp
index 98b765a6c6..4ae1f02ce2 100644
--- a/tests/auto/widgets/kernel/qsizepolicy/tst_qsizepolicy.cpp
+++ b/tests/auto/widgets/kernel/qsizepolicy/tst_qsizepolicy.cpp
@@ -113,6 +113,8 @@ void tst_QSizePolicy::constExpr()
     // check that certain ctors are constexpr (compile-only):
     { Q_CONSTEXPR QSizePolicy sp; Q_UNUSED(sp); }
     { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(); Q_UNUSED(sp); }
+    { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(QSizePolicy::Fixed, QSizePolicy::Preferred); Q_UNUSED(sp); }
+    { Q_CONSTEXPR QSizePolicy sp = QSizePolicy(QSizePolicy::Minimum, QSizePolicy::Expanding, QSizePolicy::DefaultType); Q_UNUSED(sp); }
 #else
     QSKIP("QSizePolicy cannot be constexpr with this version of the compiler.");
 #endif