diff --git a/test/test_snmp_union.sh b/test/test_snmp_union.sh
index 11344638..d076850b 100644
--- a/test/test_snmp_union.sh
+++ b/test/test_snmp_union.sh
@@ -152,7 +152,7 @@ function testexit(){
 
 ENTITY_OID=".1.3.6.1.2.1.47.1.1.1"
 
-expectpart "$($snmpwalk)" 0 "0.0"
+expectpart "$($snmpwalk -Ci .1.3.6)" 0 "0.0"
 
 # first string, value=first
 OID_FIRST="${ENTITY_OID}.1.1.1"