diff --git a/src/add-ons/kernel/file_systems/userlandfs/server/beos/beos_kernel_emu.cpp b/src/add-ons/kernel/file_systems/userlandfs/server/beos/beos_kernel_emu.cpp
index f92d450c00..a5d09e43f6 100644
--- a/src/add-ons/kernel/file_systems/userlandfs/server/beos/beos_kernel_emu.cpp
+++ b/src/add-ons/kernel/file_systems/userlandfs/server/beos/beos_kernel_emu.cpp
@@ -6,6 +6,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 
+#include <AppDefs.h>
 #include <NodeMonitor.h>
 
 #include <legacy/cache.h>