diff --git a/modules/imRtdProvider.js b/modules/imRtdProvider.js
index 32d45f46f49..46573a81c15 100644
--- a/modules/imRtdProvider.js
+++ b/modules/imRtdProvider.js
@@ -109,6 +109,7 @@ export function setRealTimeData(bidConfig, moduleConfig, data) {
     const segments = getSegments(data.im_segments, moduleConfig);
     const ortb2 = bidConfig.ortb2Fragments?.global || {};
     deepSetValue(ortb2, 'user.ext.data.im_segments', segments);
+    deepSetValue(ortb2, 'user.ext.data.im_uid', data.im_uid);
 
     if (moduleConfig.params.setGptKeyValues || !moduleConfig.params.hasOwnProperty('setGptKeyValues')) {
       window.googletag = window.googletag || {cmd: []};