diff --git a/voltha b/voltha
index 6413d39..2a2af90 100755
--- a/voltha
+++ b/voltha
@@ -2531,8 +2531,11 @@
 # therecanbeonlyone set hardcoded to true for backward compatibility
 INTERNAL_EXTRA_HELM_INSTALL_ARGS="--set therecanbeonlyone=true"
 
-# customize the topics in case of multiple stacks sharing the same kafka
-INTERNAL_EXTRA_HELM_INSTALL_ARGS+=" --set defaults.topics.core_topic=$NAME-rwcore,defaults.kv_store_data_prefix=service/$NAME"
+if [[ $(semver_greater "$VOLTHA_CHART_VERSION" "2.6.7") == "true" ]]; then
+  # this is past voltha-2.5, we support multiple stacks
+  # customize the topics in case of multiple stacks sharing the same kafka
+  INTERNAL_EXTRA_HELM_INSTALL_ARGS+=" --set defaults.topics.core_topic=$NAME-rwcore,defaults.kv_store_data_prefix=service/$NAME"
+fi
 
 case $WITH_ETCD in
     no)
@@ -2622,7 +2625,10 @@
 if [ "$WITH_ADAPTERS" == "yes" ]; then
     STIME="$(date +%s)"
     EXPECT=0
-    INTERNAL_EXTRA_HELM_INSTALL_ARGS+=" --set defaults.topics.core_topic=$NAME-rwcore,defaults.topics.adapter_open_olt_topic=$NAME-openolt,defaults.topics.adapter_open_onu_topic=$NAME-brcm_openomci_onu,defaults.kv_store_data_prefix=service/$NAME"
+    if [[ $(semver_greater "$VOLTHA_ADAPTER_OPEN_ONU_CHART_VERSION" "2.5.0") == "true" ]]; then
+      # this is past voltha-2.5, we support multiple stacks
+      INTERNAL_EXTRA_HELM_INSTALL_ARGS+=" --set defaults.topics.core_topic=$NAME-rwcore,defaults.topics.adapter_open_olt_topic=$NAME-openolt,defaults.topics.adapter_open_onu_topic=$NAME-brcm_openomci_onu,defaults.kv_store_data_prefix=service/$NAME"
+    fi
     if is_in "$WITH_ETCD" "yes,external"; then
         _HOST=etcd.$INFRA_NS.svc
         _PORT=2379