diff --git a/packages/esbuild/test/css/BUILD.bazel b/packages/esbuild/test/css/BUILD.bazel
index 2652e11299..7d511cc07f 100644
--- a/packages/esbuild/test/css/BUILD.bazel
+++ b/packages/esbuild/test/css/BUILD.bazel
@@ -34,6 +34,10 @@ ts_library(
 
 esbuild(
     name = "default",
+    args = [
+        "--keep-names",
+        "--resolve-extensions=.mjs,.js",
+    ],
     entry_point = "main.ts",
     deps = [
         ":main",
@@ -42,6 +46,10 @@ esbuild(
 
 esbuild(
     name = "with_css",
+    args = [
+        "--keep-names",
+        "--resolve-extensions=.mjs,.js",
+    ],
     entry_point = "main.ts",
     output_css = True,
     deps = [