diff --git a/src/previewBase.pro b/src/previewBase.pro
index 33ce59a..c053b31 100644
--- a/src/previewBase.pro
+++ b/src/previewBase.pro
@@ -10,9 +10,7 @@ TEMPLATE = lib
 CONFIG += plugins
 CONFIG += dll
 
-contains(QT_VERSION, "^5.*") {
-	QT += widgets
-}
+greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 
 DEFINES += PREVIEWBASE_LIBRARY