diff --git a/plugins/open-code-review/opencode/open-code-review.ts b/plugins/open-code-review/opencode/open-code-review.ts
index bc5fd2b..63d0f26 100644
--- a/plugins/open-code-review/opencode/open-code-review.ts
+++ b/plugins/open-code-review/opencode/open-code-review.ts
@@ -178,7 +178,7 @@ async function runOcr(args: string[], options: RunOptions): Promise<RunResult> {
         cwd: options.cwd,
         env: process.env,
         shell: false,
-        detached: true,
+        detached: process.platform !== "win32",
       },
     )
     child.stdin.end()
diff --git a/plugins/open-code-review/opencode/test/open-code-review.test.mjs b/plugins/open-code-review/opencode/test/open-code-review.test.mjs
index 780514b..629e983 100644
--- a/plugins/open-code-review/opencode/test/open-code-review.test.mjs
+++ b/plugins/open-code-review/opencode/test/open-code-review.test.mjs
@@ -358,6 +358,24 @@ test("ocr_review reports non-zero exits with OCR output", async () => {
   )
 })
 
+test("ocr_review preserves output from the Windows command shim", { skip: process.platform !== "win32" }, async () => {
+  await withFakeOcr(
+    "console.error('windows shim output'); process.exit(7)",
+    async (worktree) => {
+      const { hooks } = await loadPlugin(worktree)
+      await assert.rejects(
+        hooks.tool.ocr_review.execute({}, toolContext(worktree)),
+        (error) => {
+          assert.equal(error.name, "OcrExecutionError")
+          assert.equal(error.exitCode, 7)
+          assert.match(error.message, /windows shim output/)
+          return true
+        },
+      )
+    },
+  )
+})
+
 test("ocr_review removes its temporary background after a non-zero exit", async () => {
   await withFakeOcr(
     [