diff --git a/cassandra/values.yaml b/cassandra/values.yaml
index d0c466a..f301e80 100644
--- a/cassandra/values.yaml
+++ b/cassandra/values.yaml
@@ -210,6 +210,7 @@ args: []
 ##
 extraEnvVars:
   - name: CASSANDRA_CFG_YAML_SASI_INDEXES_ENABLED
+    value: "true"
 
 ## @param extraEnvVarsCM Name of existing ConfigMap containing extra env vars
 ##