diff --git a/sys/mips/include/runq.h b/sys/mips/include/runq.h
index 2e573010f933..c19cbb98cd1e 100644
--- a/sys/mips/include/runq.h
+++ b/sys/mips/include/runq.h
@@ -30,11 +30,16 @@
 #ifndef _MACHINE_RUNQ_H_
 #define	_MACHINE_RUNQ_H_
 
+#if defined(__mips_n64)
+#define	RQB_LEN		(1)		/* Number of priority status words. */
+#define	RQB_L2BPW	(6)		/* Log2(sizeof(rqb_word_t) * NBBY)). */
+#else
 #define	RQB_LEN		(2)		/* Number of priority status words. */
 #define	RQB_L2BPW	(5)		/* Log2(sizeof(rqb_word_t) * NBBY)). */
+#endif
 #define	RQB_BPW		(1<<RQB_L2BPW)	/* Bits in an rqb_word_t. */
 
-#define	RQB_BIT(pri)	(1 << ((pri) & (RQB_BPW - 1)))
+#define	RQB_BIT(pri)	(1ul << ((pri) & (RQB_BPW - 1)))
 #define	RQB_WORD(pri)	((pri) >> RQB_L2BPW)
 
 #define	RQB_FFS(word)	(ffs(word) - 1)
@@ -42,6 +47,10 @@
 /*
  * Type of run queue status word.
  */
-typedef u_int32_t	rqb_word_t;
+#if defined(__mips_n64)
+typedef	u_int64_t	rqb_word_t;
+#else
+typedef	u_int32_t	rqb_word_t;
+#endif
 
 #endif