diff --git a/Dockerfile.sandbox b/Dockerfile.sandbox
index fe2cc7e380b..8b50c7a6745 100644
--- a/Dockerfile.sandbox
+++ b/Dockerfile.sandbox
@@ -14,7 +14,7 @@ RUN --mount=type=cache,id=openclaw-sandbox-bookworm-apt-cache,target=/var/cache/
     git \
     jq \
     python3 \
-    ripgrep \
+    ripgrep
 
 RUN useradd --create-home --shell /bin/bash sandbox
 USER sandbox
diff --git a/Dockerfile.sandbox-common b/Dockerfile.sandbox-common
index 930aec0aef5..39eaa3692b4 100644
--- a/Dockerfile.sandbox-common
+++ b/Dockerfile.sandbox-common
@@ -24,7 +24,7 @@ ENV PATH=${BUN_INSTALL_DIR}/bin:${BREW_INSTALL_DIR}/bin:${BREW_INSTALL_DIR}/sbin
 RUN --mount=type=cache,id=openclaw-sandbox-common-apt-cache,target=/var/cache/apt,sharing=locked \
   --mount=type=cache,id=openclaw-sandbox-common-apt-lists,target=/var/lib/apt,sharing=locked \
   apt-get update \
-  && apt-get install -y --no-install-recommends ${PACKAGES} \
+  && apt-get install -y --no-install-recommends ${PACKAGES}
 
 RUN if [ "${INSTALL_PNPM}" = "1" ]; then npm install -g pnpm; fi
 
diff --git a/scripts/docker/cleanup-smoke/Dockerfile b/scripts/docker/cleanup-smoke/Dockerfile
index 4519ff9a385..e67a4b1fe87 100644
--- a/scripts/docker/cleanup-smoke/Dockerfile
+++ b/scripts/docker/cleanup-smoke/Dockerfile
@@ -8,7 +8,7 @@ RUN --mount=type=cache,id=openclaw-cleanup-smoke-apt-cache,target=/var/cache/apt
   && apt-get install -y --no-install-recommends \
     bash \
     ca-certificates \
-    git \
+    git
 
 WORKDIR /repo
 COPY package.json pnpm-lock.yaml pnpm-workspace.yaml ./
diff --git a/src/docker-build-cache.test.ts b/src/docker-build-cache.test.ts
index 3935e1185d4..08ff562099f 100644
--- a/src/docker-build-cache.test.ts
+++ b/src/docker-build-cache.test.ts
@@ -56,6 +56,32 @@ describe("docker build cache layout", () => {
     }
   });
 
+  it("does not leave empty shell continuation lines in sandbox-common", async () => {
+    const dockerfile = await readRepoFile("Dockerfile.sandbox-common");
+    expect(dockerfile).not.toContain("apt-get install -y --no-install-recommends ${PACKAGES} \\");
+    expect(dockerfile).toContain(
+      'RUN if [ "${INSTALL_PNPM}" = "1" ]; then npm install -g pnpm; fi',
+    );
+  });
+
+  it("does not leave blank lines after shell continuation markers", async () => {
+    for (const path of [
+      "Dockerfile.sandbox",
+      "Dockerfile.sandbox-browser",
+      "Dockerfile.sandbox-common",
+      "scripts/docker/cleanup-smoke/Dockerfile",
+      "scripts/docker/install-sh-smoke/Dockerfile",
+      "scripts/docker/install-sh-e2e/Dockerfile",
+      "scripts/docker/install-sh-nonroot/Dockerfile",
+    ]) {
+      const dockerfile = await readRepoFile(path);
+      expect(
+        dockerfile,
+        `${path} should not have blank lines after a trailing backslash`,
+      ).not.toMatch(/\\\n\s*\n/);
+    }
+  });
+
   it("copies only install inputs before pnpm install in the e2e image", async () => {
     const dockerfile = await readRepoFile("scripts/e2e/Dockerfile");
     const installIndex = dockerfile.indexOf("pnpm install --frozen-lockfile");