diff --git a/src/plugins/coreplugin/coreconstants.h b/src/plugins/coreplugin/coreconstants.h
index 77052130fdb..0098fc4601c 100644
--- a/src/plugins/coreplugin/coreconstants.h
+++ b/src/plugins/coreplugin/coreconstants.h
@@ -198,7 +198,7 @@ const char SETTINGS_ID_MIMETYPES[] = "E.MimeTypes";
 const char SETTINGS_DEFAULTTEXTENCODING[] = "General/DefaultFileEncoding";
 
 const char SETTINGS_THEME[] = "Core/CreatorTheme";
-const char DEFAULT_THEME[] = "default";
+const char DEFAULT_THEME[] = "flat";
 
 const char ALL_FILES_FILTER[]      = QT_TRANSLATE_NOOP("Core", "All Files (*)");