diff --git a/src/add-ons/kernel/file_systems/userlandfs/server/haiku/HaikuKernelFileSystem.cpp b/src/add-ons/kernel/file_systems/userlandfs/server/haiku/HaikuKernelFileSystem.cpp
index 1d11494536..f167c98c94 100644
--- a/src/add-ons/kernel/file_systems/userlandfs/server/haiku/HaikuKernelFileSystem.cpp
+++ b/src/add-ons/kernel/file_systems/userlandfs/server/haiku/HaikuKernelFileSystem.cpp
@@ -15,6 +15,7 @@
 
 #include <block_cache.h>
 #include <condition_variable.h>
+#include <file_cache.h>
 
 #include "HaikuKernelIORequest.h"
 #include "HaikuKernelVolume.h"
@@ -121,6 +122,11 @@ HaikuKernelFileSystem::Init()
 	if (error != B_OK)
 		RETURN_ERROR(error);
 
+	// init file map
+	error = file_map_init();
+	if (error != B_OK)
+		RETURN_ERROR(error);
+
 	// create I/O request map
 	fIORequests = new(std::nothrow) IORequestTable;
 	if (fIORequests == NULL)