diff --git a/lib/rhashtable.c b/lib/rhashtable.c
index e96fc00..9cc4c4a 100644
--- a/lib/rhashtable.c
+++ b/lib/rhashtable.c
@@ -23,6 +23,7 @@
 #include <linux/jhash.h>
 #include <linux/random.h>
 #include <linux/rhashtable.h>
+#include <linux/err.h>
 
 #define HASH_DEFAULT_SIZE	64UL
 #define HASH_MIN_SIZE		4UL