diff --git a/src/posthog-core.ts b/src/posthog-core.ts
index ab4e2809c..925a39c48 100644
--- a/src/posthog-core.ts
+++ b/src/posthog-core.ts
@@ -1537,7 +1537,7 @@ export class PostHog {
         this.surveys?.reset()
         this.persistence?.set_property(USER_STATE, 'anonymous')
         this.sessionManager?.resetSessionId()
-        const uuid = this.config.__use_cookieless_server_hash
+        const uuid = this.config.__preview_experimental_cookieless_mode
             ? COOKIELESS_SENTINEL_VALUE
             : this.config.get_device_id(uuidv7())
         this.register_once(
@@ -2057,7 +2057,7 @@ export class PostHog {
     }
 
     private _create_device_id(): string {
-        if (this.config.__use_cookieless_server_hash) {
+        if (this.config.__preview_experimental_cookieless_mode) {
             return COOKIELESS_SENTINEL_VALUE
         }
         return this.config.get_device_id(uuidv7())
diff --git a/src/sessionid.ts b/src/sessionid.ts
index 83d906c58..4519fe4c3 100644
--- a/src/sessionid.ts
+++ b/src/sessionid.ts
@@ -230,7 +230,7 @@ export class SessionIdManager {
         const noSessionId = !sessionId
         const activityTimeout = !readOnly && Math.abs(timestamp - lastTimestamp) > this.sessionTimeoutMs
         if (noSessionId || activityTimeout || sessionPastMaximumLength) {
-            if (this.config.__use_cookieless_server_hash) {
+            if (this.config.__preview_experimental_cookieless_mode) {
                 sessionId = COOKIELESS_SENTINEL_VALUE
             } else {
                 sessionId = this._sessionIdGenerator()
diff --git a/src/types.ts b/src/types.ts
index 5b6e5040d..02d2d709b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -347,9 +347,9 @@ export interface PostHogConfig {
 
     /**
      * PREVIEW - MAY CHANGE WITHOUT WARNING - DO NOT USE IN PRODUCTION
-     * whether to send a sentinel distinct id value, which will be replaced on the server by a hash
+     * whether to send a sentinel value for distinct id, device id, and session id, which will be replaced server-side by a cookieless hash
      * */
-    __use_cookieless_server_hash?: boolean
+    __preview_experimental_cookieless_mode?: boolean
 }
 
 export interface OptInOutCapturingOptions {