diff --git a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
index 30c43b67dc..fb324afbd8 100644
--- a/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
+++ b/src/plugins/platformthemes/xdgdesktopportal/qxdgdesktopportaltheme.cpp
@@ -65,7 +65,7 @@ public:
         delete baseTheme;
     }
 
-    QPlatformTheme *baseTheme;
+    QPlatformTheme *baseTheme = nullptr;
     uint fileChooserPortalVersion = 0;
 };