diff --git a/sys/dev/isp/isp_pci.c b/sys/dev/isp/isp_pci.c
index 73cdb5497dd3..c5af27e84d9b 100644
--- a/sys/dev/isp/isp_pci.c
+++ b/sys/dev/isp/isp_pci.c
@@ -835,8 +835,10 @@ isp_pci_rd_isr_2300(struct ispsoftc *isp, u_int16_t *isrp,
 	struct isp_pcisoftc *pcs = (struct isp_pcisoftc *) isp;
 	u_int32_t r2hisr;
 
-	if ((BXR2(pcs, IspVirt2Off(isp, BIU_ISR) & BIU2100_ISR_RISC_INT)) == 0)
+	if (!(BXR2(pcs, IspVirt2Off(isp, BIU_ISR) & BIU2100_ISR_RISC_INT))) {
+		*isrp = 0;
 		return (0);
+	}
 	r2hisr = bus_space_read_4(pcs->pci_st, pcs->pci_sh,
 	    IspVirt2Off(pcs, BIU_R2HSTSLO));
 	isp_prt(isp, ISP_LOGDEBUG3, "RISC2HOST ISR 0x%x", r2hisr);