diff --git a/functions/defaults.sh b/functions/defaults.sh
index 08da78223..0598eadd1 100755
--- a/functions/defaults.sh
+++ b/functions/defaults.sh
@@ -596,7 +596,7 @@ Set_defaults ()
 					;;
 			esac
 
-			LB_PARENT_MIRROR_BINARY_VOLATILE="${LB_PARENT_MIRROR_BINARY_VOLATILE:-${LB_PARENT_MIRROR}}"
+			LB_PARENT_MIRROR_BINARY_VOLATILE="${LB_PARENT_MIRROR_BINARY_VOLATILE:-${LB_PARENT_MIRROR_BINARY}}"
 			;;
 
 		*)