diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index 9f6c928..f17ceca 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -14,6 +14,7 @@
 #define FSCACHE_DEBUG_LEVEL OPERATION
 #include <linux/module.h>
 #include <linux/seq_file.h>
+#include <linux/slab.h>
 #include "internal.h"
 
 atomic_t fscache_op_debug_id;