diff --git a/common/predictive-text/unit_tests/in_browser/cases/worker-trie-integration.js b/common/predictive-text/unit_tests/in_browser/cases/worker-trie-integration.js
index c068daf8f1..4d7d34acdf 100644
--- a/common/predictive-text/unit_tests/in_browser/cases/worker-trie-integration.js
+++ b/common/predictive-text/unit_tests/in_browser/cases/worker-trie-integration.js
@@ -60,7 +60,7 @@ describe('LMLayer using the trie model', function () {
     //
     // https://community.software.sil.org/t/search-term-to-key-in-lexical-model-not-working-both-ways-by-default/3133
     it('should use the default searchTermToKey()', function () {
-      var lmLayer = new LMLayer(helpers.defaultCapabilities, Worker.constructInstance());
+      var lmLayer = new LMLayer(helpers.defaultCapabilities, Worker.constructInstance(), /* testMode */ true);
 
       return lmLayer.loadModel(
         // We need to provide an absolute path since the worker is based within a blob.