diff --git a/include/sys/arc.h b/include/sys/arc.h
index dd9b128bc..443597df0 100644
--- a/include/sys/arc.h
+++ b/include/sys/arc.h
@@ -150,6 +150,11 @@ void l2arc_fini(void);
 void l2arc_start(void);
 void l2arc_stop(void);
 
+/* Global tunings */
+extern int zfs_write_limit_shift;
+extern unsigned long zfs_write_limit_max;
+extern kmutex_t zfs_write_limit_lock;
+
 #ifdef	__cplusplus
 }
 #endif
diff --git a/module/zfs/arc.c b/module/zfs/arc.c
index 55f1909c5..829b4d9c3 100644
--- a/module/zfs/arc.c
+++ b/module/zfs/arc.c
@@ -147,10 +147,6 @@ static kmutex_t		arc_reclaim_thr_lock;
 static kcondvar_t	arc_reclaim_thr_cv;	/* used to signal reclaim thr */
 static uint8_t		arc_thread_exit;
 
-extern int zfs_write_limit_shift;
-extern uint64_t zfs_write_limit_max;
-extern kmutex_t zfs_write_limit_lock;
-
 /* number of bytes to prune from caches when at arc_meta_limit is reached */
 uint_t arc_meta_prune = 1048576;