diff --git a/src/gui/image/qiconloader.cpp b/src/gui/image/qiconloader.cpp
index 077eefacb3c..aed173d76e5 100644
--- a/src/gui/image/qiconloader.cpp
+++ b/src/gui/image/qiconloader.cpp
@@ -142,6 +142,11 @@ void QIconLoader::invalidateKey()
     QIconPrivate::clearIconCache();
 }
 
+QString QIconLoader::themeName() const
+{
+    return m_userTheme.isEmpty() ? m_systemTheme : m_userTheme;
+}
+
 void QIconLoader::setThemeName(const QString &themeName)
 {
     if (m_userTheme == themeName)
diff --git a/src/gui/image/qiconloader_p.h b/src/gui/image/qiconloader_p.h
index fbb21073ce3..0245123a833 100644
--- a/src/gui/image/qiconloader_p.h
+++ b/src/gui/image/qiconloader_p.h
@@ -146,7 +146,7 @@ public:
     QThemeIconInfo loadIcon(const QString &iconName) const;
     uint themeKey() const { return m_themeKey; }
 
-    QString themeName() const { return m_userTheme.isEmpty() ? m_systemTheme : m_userTheme; }
+    QString themeName() const;
     void setThemeName(const QString &themeName);
     QString fallbackThemeName() const;
     void setFallbackThemeName(const QString &themeName);