--- qtsvg/src/svg/qsvgfont_p.h
+++ qtsvg/src/svg/qsvgfont_p.h
@@ -38,6 +38,7 @@ public:
 class Q_SVG_PRIVATE_EXPORT QSvgFont : public QSvgRefCounted
 {
 public:
+    static constexpr qreal DEFAULT_UNITS_PER_EM = 1000;
     QSvgFont(qreal horizAdvX);
 
     void setFamilyName(const QString &name);
@@ -50,9 +51,7 @@ public:
     void draw(QPainter *p, const QPointF &point, const QString &str, qreal pixelSize, Qt::Alignment alignment) const;
 public:
     QString m_familyName;
-    qreal m_unitsPerEm;
-    qreal m_ascent;
-    qreal m_descent;
+    qreal m_unitsPerEm = DEFAULT_UNITS_PER_EM;
     qreal m_horizAdvX;
     QHash<QChar, QSvgGlyph> m_glyphs;
 };


--- qtsvg/src/svg/qsvghandler.cpp
+++ qtsvg/src/svg/qsvghandler.cpp
@@ -2622,7 +2622,7 @@ static bool parseFontFaceNode(QSvgStyleProperty *parent,
 
     qreal unitsPerEm = toDouble(unitsPerEmStr);
     if (!unitsPerEm)
-        unitsPerEm = 1000;
+        unitsPerEm = QSvgFont::DEFAULT_UNITS_PER_EM;
 
     if (!name.isEmpty())
         font->setFamilyName(name);
