diff --git a/modules/id5IdSystem.js b/modules/id5IdSystem.js
index 45ddc85da5f..baa2ff954dc 100644
--- a/modules/id5IdSystem.js
+++ b/modules/id5IdSystem.js
@@ -58,7 +58,7 @@ export const id5IdSubmodule = {
     }
 
     // check for A/B testing configuration and hide ID if in Control Group
-    let abConfig = (config && config.params && config.params.abTesting) || { enabled: false };
+    let abConfig = getAbTestingConfig(config);
     let controlGroup = false;
     if (
       abConfig.enabled === true &&
@@ -130,6 +130,10 @@ export const id5IdSubmodule = {
       'v': '$prebid.version$'
     };
 
+    if (getAbTestingConfig(config).enabled === true) {
+      utils.deepSetValue(data, 'features.ab', 1);
+    }
+
     const resp = function (callback) {
       const callbacks = {
         success: response => {
@@ -282,4 +286,14 @@ export function storeInLocalStorage(key, value, expDays) {
   storage.setDataInLocalStorage(`${key}`, value);
 }
 
+/**
+ * gets the existing abTesting config or generates a default config with abTesting off
+ *
+ * @param {SubmoduleConfig|undefined} config
+ * @returns {(Object|undefined)}
+ */
+function getAbTestingConfig(config) {
+  return (config && config.params && config.params.abTesting) || { enabled: false };
+}
+
 submodule('userId', id5IdSubmodule);
diff --git a/test/spec/modules/id5IdSystem_spec.js b/test/spec/modules/id5IdSystem_spec.js
index 24f50db9980..59fa8977fc8 100644
--- a/test/spec/modules/id5IdSystem_spec.js
+++ b/test/spec/modules/id5IdSystem_spec.js
@@ -238,6 +238,47 @@ describe('ID5 ID System', function() {
       expect(getNbFromCache(ID5_TEST_PARTNER_ID)).to.be.eq(0);
     });
 
+    it('should call the ID5 server with ab feature = 1 when abTesting is turned on', function () {
+      let id5Config = getId5FetchConfig();
+      id5Config.params.abTesting = { enabled: true, controlGroupPct: 10 }
+
+      let submoduleCallback = id5IdSubmodule.getId(id5Config, undefined, ID5_STORED_OBJ).callback;
+      submoduleCallback(callbackSpy);
+
+      let request = server.requests[0];
+      let requestBody = JSON.parse(request.requestBody);
+      expect(requestBody.features.ab).to.eq(1);
+
+      request.respond(200, responseHeader, JSON.stringify(ID5_JSON_RESPONSE));
+    });
+
+    it('should call the ID5 server without ab feature when abTesting is turned off', function () {
+      let id5Config = getId5FetchConfig();
+      id5Config.params.abTesting = { enabled: false, controlGroupPct: 10 }
+
+      let submoduleCallback = id5IdSubmodule.getId(id5Config, undefined, ID5_STORED_OBJ).callback;
+      submoduleCallback(callbackSpy);
+
+      let request = server.requests[0];
+      let requestBody = JSON.parse(request.requestBody);
+      expect(requestBody.features).to.be.undefined;
+
+      request.respond(200, responseHeader, JSON.stringify(ID5_JSON_RESPONSE));
+    });
+
+    it('should call the ID5 server without ab feature when when abTesting is not set', function () {
+      let id5Config = getId5FetchConfig();
+
+      let submoduleCallback = id5IdSubmodule.getId(id5Config, undefined, ID5_STORED_OBJ).callback;
+      submoduleCallback(callbackSpy);
+
+      let request = server.requests[0];
+      let requestBody = JSON.parse(request.requestBody);
+      expect(requestBody.features).to.be.undefined;
+
+      request.respond(200, responseHeader, JSON.stringify(ID5_JSON_RESPONSE));
+    });
+
     it('should store the privacy object from the ID5 server response', function () {
       let submoduleCallback = id5IdSubmodule.getId(getId5FetchConfig(), undefined, ID5_STORED_OBJ).callback;
       submoduleCallback(callbackSpy);