diff --git a/sys/compat/linuxkpi/common/include/linux/refcount.h b/sys/compat/linuxkpi/common/include/linux/refcount.h
--- a/sys/compat/linuxkpi/common/include/linux/refcount.h
+++ b/sys/compat/linuxkpi/common/include/linux/refcount.h
@@ -30,6 +30,7 @@
 #define _LINUXKPI_LINUX_REFCOUNT_H
 
 #include <linux/atomic.h>
+#include <linux/spinlock.h>
 
 typedef atomic_t refcount_t;