diff --git a/src/gui/image/qiconloader.cpp b/src/gui/image/qiconloader.cpp
index 3fa3bb9c598..ac7a6864f82 100644
--- a/src/gui/image/qiconloader.cpp
+++ b/src/gui/image/qiconloader.cpp
@@ -79,6 +79,9 @@ QIconLoader::QIconLoader() :
 
 static inline QString systemThemeName()
 {
+    const auto override = qgetenv("QT_QPA_SYSTEM_ICON_THEME");
+    if (!override.isEmpty())
+        return QString::fromLocal8Bit(override);
     if (const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme()) {
         const QVariant themeHint = theme->themeHint(QPlatformTheme::SystemIconThemeName);
         if (themeHint.isValid())