diff --git a/apps/opencs/model/prefs/category.hpp b/apps/opencs/model/prefs/category.hpp
index 43a6325ee..23caba5e4 100644
--- a/apps/opencs/model/prefs/category.hpp
+++ b/apps/opencs/model/prefs/category.hpp
@@ -1,7 +1,7 @@
 #ifndef CSV_PREFS_CATEGORY_H
 #define CSM_PREFS_CATEGORY_H
 
-#include <iostream>
+#include <string>
 
 namespace CSMPrefs
 {