diff --git a/Modules/QtWidgets/test/CMakeLists.txt b/Modules/QtWidgets/test/CMakeLists.txt
index fe9484dd12..b7ff9b62be 100644
--- a/Modules/QtWidgets/test/CMakeLists.txt
+++ b/Modules/QtWidgets/test/CMakeLists.txt
@@ -1,9 +1,9 @@
 MITK_CREATE_MODULE_TESTS()
 
 if(UNIX AND NOT APPLE)
-  set(qt_platform "-platform minimal")
+  set(qt_platform -platform minimal)
 else()
   unset(qt_platform)
 endif()
 
 mitkAddCustomModuleTest(QmitkAbstractNodeSelectionWidgetTest QmitkAbstractNodeSelectionWidgetTest ${qt_platform})