diff --git a/python_modules/dagster-webserver/dagster_webserver/webserver.py b/python_modules/dagster-webserver/dagster_webserver/webserver.py
index 463467613555b..8ccc54cda00ef 100644
--- a/python_modules/dagster-webserver/dagster_webserver/webserver.py
+++ b/python_modules/dagster-webserver/dagster_webserver/webserver.py
@@ -248,7 +248,7 @@ def _static_file(path, file_path):
                 full_path = path.join(subdir, file)
                 relative_path = "/" + full_path[len(base_dir) :].lstrip(path.sep)
                 # We only need to replace BUILDTIME_ASSETPREFIX_REPLACE_ME in javascript files
-                if file.endswith(".js") or file.endswith(".js.map"):
+                if self._app_path_prefix and (file.endswith(".js") or file.endswith(".js.map")):
                     routes.append(_next_static_file(relative_path, full_path))
                 else:
                     routes.append(_static_file(relative_path, full_path))