diff --git a/src/cli/doctor/checks/gh.test.ts b/src/cli/doctor/checks/gh.test.ts
index 23593e5e..4d989dad 100644
--- a/src/cli/doctor/checks/gh.test.ts
+++ b/src/cli/doctor/checks/gh.test.ts
@@ -29,7 +29,7 @@ describe("gh cli check", () => {
 
     it("returns gh cli info structure", async () => {
       const spawnSpy = spyOn(Bun, "spawn").mockImplementation((cmd) => {
-        if (Array.isArray(cmd) && cmd[0] === "which" && cmd[1] === "gh") {
+        if (Array.isArray(cmd) && (cmd[0] === "which" || cmd[0] === "where") && cmd[1] === "gh") {
           return createProc({ stdout: "/usr/bin/gh\n" })
         }
 
diff --git a/src/cli/doctor/checks/gh.ts b/src/cli/doctor/checks/gh.ts
index 06b2ca8e..af7ade8e 100644
--- a/src/cli/doctor/checks/gh.ts
+++ b/src/cli/doctor/checks/gh.ts
@@ -13,7 +13,8 @@ export interface GhCliInfo {
 
 async function checkBinaryExists(binary: string): Promise<{ exists: boolean; path: string | null }> {
   try {
-    const proc = Bun.spawn(["which", binary], { stdout: "pipe", stderr: "pipe" })
+    const whichCmd = process.platform === "win32" ? "where" : "which"
+    const proc = Bun.spawn([whichCmd, binary], { stdout: "pipe", stderr: "pipe" })
     const output = await new Response(proc.stdout).text()
     await proc.exited
     if (proc.exitCode === 0) {