diff --git a/sys/sys/types.h b/sys/sys/types.h
index 8ebf00bf9eb..2b0910327ed 100644
--- a/sys/sys/types.h
+++ b/sys/sys/types.h
@@ -126,7 +126,7 @@ typedef	quad_t *	qaddr_t;
 typedef	char *		caddr_t;	/* core address */
 typedef	__const char *	c_caddr_t;	/* core address, pointer to const */
 typedef	__volatile char *v_caddr_t;	/* core address, pointer to volatile */
-typedef	int32_t		daddr_t;	/* disk address */
+typedef	int64_t		daddr_t;	/* disk address */
 typedef	u_int32_t	fixpt_t;	/* fixed point number */
 
 #ifdef _BSD_GID_T_