diff --git a/src/widgets/dialogs/qwizard_win.cpp b/src/widgets/dialogs/qwizard_win.cpp
index 4ecf071..d1e3335 100644
--- a/src/widgets/dialogs/qwizard_win.cpp
+++ b/src/widgets/dialogs/qwizard_win.cpp
@@ -770,6 +770,29 @@ bool QVistaHelper::drawBlackRect(const QRect &rect, HDC hdc)
     return value;
 }
 
+static int getSystemMetrics(int n)
+{
+    typedef int (WINAPI *PtrGetSystemMetrics)(int);
+    static PtrGetSystemMetrics getSystemMetricsPtr = 0;
+    if (!getSystemMetricsPtr) {
+        QSystemLibrary user32Lib(QLatin1String("user32"));
+        getSystemMetricsPtr = (PtrGetSystemMetrics)user32Lib.resolve("GetSystemMetrics");
+    }
+    return getSystemMetricsPtr ? getSystemMetricsPtr(n) : 0;
+}
+
+int QVistaHelper::frameSize()
+{
+    const int r = getSystemMetrics(SM_CYSIZEFRAME);
+    qDebug() << __FUNCTION__ << r;
+    return r;
+}
+
+int QVistaHelper::captionSize()
+{
+    return GetSystemMetrics(SM_CYCAPTION);
+}
+
 bool QVistaHelper::resolveSymbols()
 {
     static bool tried = false;
diff --git a/src/widgets/dialogs/qwizard_win_p.h b/src/widgets/dialogs/qwizard_win_p.h
index a7713d8..81514a8 100644
--- a/src/widgets/dialogs/qwizard_win_p.h
+++ b/src/widgets/dialogs/qwizard_win_p.h
@@ -117,8 +117,8 @@ private:
     bool drawTitleText(QPainter *painter, const QString &text, const QRect &rect, HDC hdc);
     static bool drawBlackRect(const QRect &rect, HDC hdc);
 
-    static int frameSize() { return GetSystemMetrics(SM_CYSIZEFRAME); }
-    static int captionSize() { return GetSystemMetrics(SM_CYCAPTION); }
+    static int frameSize();
+    static int captionSize();
 
     static int backButtonSize() { return int(QStyleHelper::dpiScaled(30)); }
     static int iconSize() { return 16; } // Standard Aero