diff --git a/src/gui/text/windows/qwindowsfontdatabase.cpp b/src/gui/text/windows/qwindowsfontdatabase.cpp
index 3b66fd1ccf..832107d827 100644
--- a/src/gui/text/windows/qwindowsfontdatabase.cpp
+++ b/src/gui/text/windows/qwindowsfontdatabase.cpp
@@ -1107,18 +1107,20 @@ bool QWindowsFontDatabase::fontsAlwaysScalable() const
 
 void QWindowsFontDatabase::derefUniqueFont(const QString &uniqueFont)
 {
-    if (m_uniqueFontData.contains(uniqueFont)) {
-        if (!m_uniqueFontData[uniqueFont].refCount.deref()) {
-            RemoveFontMemResourceEx(m_uniqueFontData[uniqueFont].handle);
-            m_uniqueFontData.remove(uniqueFont);
+    const auto it = m_uniqueFontData.find(uniqueFont);
+    if (it != m_uniqueFontData.end()) {
+        if (!it->refCount.deref()) {
+            RemoveFontMemResourceEx(it->handle);
+            m_uniqueFontData.erase(it);
         }
     }
 }
 
 void QWindowsFontDatabase::refUniqueFont(const QString &uniqueFont)
 {
-    if (m_uniqueFontData.contains(uniqueFont))
-        m_uniqueFontData[uniqueFont].refCount.ref();
+    const auto it = m_uniqueFontData.find(uniqueFont);
+    if (it != m_uniqueFontData.end())
+        it->refCount.ref();
 }
 
 QStringList QWindowsFontDatabase::fallbacksForFamily(const QString &family, QFont::Style style, QFont::StyleHint styleHint, QChar::Script script) const