diff --git a/sys/dev/ic/isp.c b/sys/dev/ic/isp.c
index 75473516538b..c837a2d68a75 100644
--- a/sys/dev/ic/isp.c
+++ b/sys/dev/ic/isp.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: isp.c,v 1.8 1997/06/22 19:57:06 mjacob Exp $	*/
+/*	$NetBSD: isp.c,v 1.9 1997/07/28 18:56:36 mjacob Exp $	*/
 
 /*
  * Machine Independent (well, as best as possible)
@@ -986,7 +986,7 @@ isp_mboxcmd(isp, mbp)
 	 * Wait until RISC int is set
 	 */
 	loops = MBOX_DELAY_COUNT;
-	while ((ISP_READ(isp, BIU_ISR) & BIU_ISR_RISC_INT) != 0) {
+	while ((ISP_READ(isp, BIU_ISR) & BIU_ISR_RISC_INT) == 0) {
 		delay(100);
 		if (--loops < 0) {
 			printf("%s: isp_mboxcmd timeout #2\n", isp->isp_name);