diff --git a/sys/bus/cam/scsi/scsi_ch.c b/sys/bus/cam/scsi/scsi_ch.c
--- a/sys/bus/cam/scsi/scsi_ch.c
+++ b/sys/bus/cam/scsi/scsi_ch.c
@@ -1298,7 +1298,7 @@
 	}
 
 	memcpy(ssvtp.vitf, csvr->csvr_voltag.cv_volid,
-	       min(strlen(csvr->csvr_voltag.cv_volid), sizeof(ssvtp.vitf)));
+	       min(strnlen((const char *)csvr->csvr_voltag.cv_volid, sizeof(csvr->csvr_voltag.cv_volid)), sizeof(ssvtp.vitf)));
 	scsi_ulto2b(csvr->csvr_voltag.cv_serial, ssvtp.minvsn);
 
 	ccb = cam_periph_getccb(periph, /*priority*/ 1);