diff --git a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
index 2fa08d30ce..fafdb37717 100644
--- a/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
+++ b/src/plugins/platforms/windows/qwindowsfontdatabase.cpp
@@ -933,8 +933,8 @@ static bool addFontToDatabase(const QString &familyName, uchar charSet,
     return true;
 }
 
-static int CALLBACK storeFont(ENUMLOGFONTEX* f, NEWTEXTMETRICEX *textmetric,
-                              int type, LPARAM namesSetIn)
+static int QT_ENSURE_STACK_ALIGNED_FOR_SSE CALLBACK
+storeFont(ENUMLOGFONTEX* f, NEWTEXTMETRICEX *textmetric, int type, LPARAM namesSetIn)
 {
     typedef QSet<QString> StringSet;
     const QString familyName = QString::fromWCharArray(f->elfLogFont.lfFaceName);