diff --git a/tools/test-js-with-puppeteer b/tools/test-js-with-puppeteer
index db2a68669c..3329192c37 100755
--- a/tools/test-js-with-puppeteer
+++ b/tools/test-js-with-puppeteer
@@ -7,7 +7,14 @@ import shlex
 
 ZULIP_PATH = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 
-os.environ["PUPPETEER_TESTS"] = "1"
+# Request the special webpack setup for frontend integration tests,
+# where webpack assets are compiled up front rather than running in
+# watch mode. We prefer the same for puppeteer, so the below line
+# makes the webpack similar to casper.
+#
+# TODO: Eventually, we'll want to rename this parameter.
+os.environ["CASPER_TESTS"] = "1"
+
 os.environ["CHROMIUM_EXECUTABLE"] = os.path.join(ZULIP_PATH, "node_modules/.bin/chromium")
 os.environ.pop("http_proxy", "")
 os.environ.pop("https_proxy", "")