--- a/toolkit/components/telemetry/tests/unit/head_GeckoView.js
+++ b/toolkit/components/telemetry/tests/unit/head_GeckoView.js
@@ -1,15 +1,16 @@
 /* Any copyright is dedicated to the Public Domain.
    http://creativecommons.org/publicdomain/zero/1.0/
 */
 "use strict";
 
 ChromeUtils.import("resource://gre/modules/PromiseUtils.jsm", this);
 ChromeUtils.import("resource://gre/modules/Services.jsm", this);
+ChromeUtils.import("resource://gre/modules/TelemetryUtils.jsm", this);
 ChromeUtils.import("resource://testing-common/ContentTaskUtils.jsm", this);
 
 const Telemetry = Services.telemetry;
 const TelemetryGeckoView = Cc["@mozilla.org/telemetry/geckoview-testing;1"]
                              .createInstance(Ci.nsITelemetryGeckoViewTesting);
 
 /**
  * Run a file in the content process.
@@ -54,8 +55,12 @@ async function waitForHistogramSnapshotD
     const data = aKeyed
       ? Telemetry.snapshotKeyedHistograms(Ci.nsITelemetry.DATASET_RELEASE_CHANNEL_OPTIN, false)
       : Telemetry.snapshotHistograms(Ci.nsITelemetry.DATASET_RELEASE_CHANNEL_OPTIN, false);
 
     return (aProcessName in data)
            && (aHistogramName in data[aProcessName]);
   });
 }
+
+if (runningInParent) {
+  Services.prefs.setBoolPref(TelemetryUtils.Preferences.OverridePreRelease, true);
+}