diff --git a/isisd/isis_snmp.c b/isisd/isis_snmp.c
index 319977f417..3590044f85 100644
--- a/isisd/isis_snmp.c
+++ b/isisd/isis_snmp.c
@@ -37,6 +37,7 @@
 #include "smux.h"
 #include "libfrr.h"
 #include "lib/version.h"
+#include "lib/zclient.h"
 
 #include "isisd/isis_constants.h"
 #include "isisd/isis_common.h"