diff --git a/src/libs/utils/layoutbuilder.h b/src/libs/utils/layoutbuilder.h
index a5a4d60cafb..ddf60185181 100644
--- a/src/libs/utils/layoutbuilder.h
+++ b/src/libs/utils/layoutbuilder.h
@@ -50,7 +50,7 @@ public:
 
     ~LayoutBuilder();
 
-    class LayoutItem
+    class QTCREATOR_UTILS_EXPORT LayoutItem
     {
     public:
         LayoutItem();