diff --git a/src/dockerfile.test.ts b/src/dockerfile.test.ts
index 29f3faa31ac..1384942866c 100644
--- a/src/dockerfile.test.ts
+++ b/src/dockerfile.test.ts
@@ -7,6 +7,10 @@ import { BUNDLED_PLUGIN_ROOT_DIR } from "../test/helpers/bundled-plugin-paths.js
 const repoRoot = resolve(fileURLToPath(new URL(".", import.meta.url)), "..");
 const dockerfilePath = join(repoRoot, "Dockerfile");
 
+function collapseDockerContinuations(dockerfile: string): string {
+  return dockerfile.replace(/\\\r?\n[ \t]*/g, " ");
+}
+
 describe("Dockerfile", () => {
   it("uses shared multi-arch base image refs for all root Node stages", async () => {
     const dockerfile = await readFile(dockerfilePath, "utf8");
@@ -51,9 +55,9 @@ describe("Dockerfile", () => {
   });
 
   it("does not override bundled plugin discovery in runtime images", async () => {
-    const dockerfile = await readFile(dockerfilePath, "utf8");
+    const dockerfile = collapseDockerContinuations(await readFile(dockerfilePath, "utf8"));
     expect(dockerfile).toContain(`ARG OPENCLAW_BUNDLED_PLUGIN_DIR=${BUNDLED_PLUGIN_ROOT_DIR}`);
-    expect(dockerfile).not.toContain("ENV OPENCLAW_BUNDLED_PLUGINS_DIR=");
+    expect(dockerfile).not.toMatch(/^\s*ENV\b[^\n]*\bOPENCLAW_BUNDLED_PLUGINS_DIR\b/m);
   });
 
   it("normalizes plugin and agent paths permissions in image layers", async () => {