diff --git a/src/qt/guiutil.cpp b/src/qt/guiutil.cpp
--- a/src/qt/guiutil.cpp
+++ b/src/qt/guiutil.cpp
@@ -68,6 +68,15 @@
 
 namespace GUIUtil {
 
+auto PortableQtWidthFunction = [](const QFontMetrics &metrics,
+                                  const QString &text) {
+#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
+    return metrics.horizontalAdvance(text);
+#else
+    return metrics.width(text);
+#endif
+};
+
 QString dateTimeStr(const QDateTime &date) {
     return date.date().toString(Qt::SystemLocaleShortDate) + QString(" ") +
            date.toString("hh:mm");
@@ -954,7 +963,7 @@
     while (font_size >= minPointSize) {
         font.setPointSizeF(font_size);
         QFontMetrics fm(font);
-        if (fm.horizontalAdvance(text) < width) {
+        if (PortableQtWidthFunction(fm, text) < width) {
             break;
         }
         font_size -= 0.5;
@@ -980,11 +989,7 @@
 }
 
 int TextWidth(const QFontMetrics &fm, const QString &text) {
-#if (QT_VERSION >= QT_VERSION_CHECK(5, 11, 0))
-    return fm.horizontalAdvance(text);
-#else
-    return fm.width(text);
-#endif
+    return PortableQtWidthFunction(fm, text);
 }
 
 void PolishProgressDialog(QProgressDialog *dialog) {