diff --git a/redhat/quagga.spec.in b/redhat/quagga.spec.in
index dce0308..bb0a1d0 100644
--- a/redhat/quagga.spec.in
+++ b/redhat/quagga.spec.in
@@ -16,7 +16,7 @@
 %{!?with_ospfclient:	%define		with_ospfclient 1 }
 %{!?with_ospfapi:	%define		with_ospfapi	1 }
 %{!?with_irdp:		%define		with_irdp	1 }
-%{!?with_isisd:		%define		with_isisd	0 }
+%{!?with_isisd:		%define		with_isisd	1 }
 %{!?with_shared:	%define		with_shared	1 }
 %{!?with_multipath:	%define		with_multipath	64 }
 %{!?quagga_user:	%define		quagga_user	quagga }