diff --git a/channels/chan_zap.c b/channels/chan_zap.c
index 3dbbb3be87..348856f106 100644
--- a/channels/chan_zap.c
+++ b/channels/chan_zap.c
@@ -6541,7 +6541,9 @@ static int handle_init_event(struct zt_pvt *i, int event)
 		case SIG_FXOLS:
 		case SIG_FXOGS:
 		case SIG_FXOKS:
-		        zt_set_hook(i->subs[SUB_REAL].zfd, ZT_OFFHOOK);
+			res = zt_set_hook(i->subs[SUB_REAL].zfd, ZT_OFFHOOK);
+			if (res && (errno == EBUSY))
+				break;
 			if (i->cidspill) {
 				/* Cancel VMWI spill */
 				free(i->cidspill);