diff --git a/sys/dev/isp/isp_sbus.c b/sys/dev/isp/isp_sbus.c
index 7f912892bbe..14b3941676f 100644
--- a/sys/dev/isp/isp_sbus.c
+++ b/sys/dev/isp/isp_sbus.c
@@ -53,7 +53,7 @@ __FBSDID("$FreeBSD$");
 
 static uint32_t isp_sbus_rd_reg(ispsoftc_t *, int);
 static void isp_sbus_wr_reg(ispsoftc_t *, int, uint32_t);
-static int isp_sbus_rd_isr(ispsoftc_t *, uint32_t *, uint16_t *, uint16_t *);
+static int isp_sbus_rd_isr(ispsoftc_t *, uint16_t *, uint16_t *, uint16_t *);
 static int isp_sbus_mbxdma(ispsoftc_t *);
 static int isp_sbus_dmasetup(ispsoftc_t *, XS_T *, void *);