diff --git a/src/add-ons/kernel/file_systems/overlay/overlay.cpp b/src/add-ons/kernel/file_systems/overlay/overlay.cpp
index 79c2bf8c05..876f4aa112 100644
--- a/src/add-ons/kernel/file_systems/overlay/overlay.cpp
+++ b/src/add-ons/kernel/file_systems/overlay/overlay.cpp
@@ -12,6 +12,8 @@
 
 #include <dirent.h>
 
+#include <util/kernel_cpp.h>
+
 #include <fs_info.h>
 #include <fs_interface.h>