diff --git a/src/gui/image/qicon.cpp b/src/gui/image/qicon.cpp
index d3fe8791b7b..2b607ac5be7 100644
--- a/src/gui/image/qicon.cpp
+++ b/src/gui/image/qicon.cpp
@@ -1377,8 +1377,7 @@ bool QIcon::hasThemeIcon(const QString &name)
 */
 void QIcon::setIsMask(bool isMask)
 {
-    if (d)
-        detach();
+    detach();
     if (!d)
         d = new QIconPrivate(new QPixmapIconEngine);
     d->is_mask = isMask;