diff --git a/src/utils/extension/extension.ts b/src/utils/extension/extension.ts
new file mode 100644
index 00000000..33e0646d
--- /dev/null
+++ b/src/utils/extension/extension.ts
@@ -0,0 +1,15 @@
+/** Add bin extension to a binary. This will be `.exe` on Windows. */
+export function addBinExtension(name: string) {
+  if (process.platform === "win32") {
+    return `${name}.exe`
+  }
+  return name
+}
+
+/** Add native shell extension. This will be `.bat` on Windows and `sh` on unix. */
+export function addShellExtension(name: string) {
+  if (process.platform === "win32") {
+    return `${name}.bat`
+  }
+  return `${name}.sh`
+}
diff --git a/src/utils/setup/setupBin.ts b/src/utils/setup/setupBin.ts
index d605d890..411c4773 100644
--- a/src/utils/setup/setupBin.ts
+++ b/src/utils/setup/setupBin.ts
@@ -89,10 +89,3 @@ export async function setupBin(
 
   return { installDir, binDir }
 }
-/** Add bin extension to a binary. This will be `.exe` on Windows. */
-export function addBinExtension(name: string) {
-  if (process.platform === "win32") {
-    return `${name}.exe`
-  }
-  return name
-}
diff --git a/src/utils/tests/test-helpers.ts b/src/utils/tests/test-helpers.ts
index eff0bb81..eef4da04 100644
--- a/src/utils/tests/test-helpers.ts
+++ b/src/utils/tests/test-helpers.ts
@@ -1,7 +1,7 @@
 import * as io from "@actions/io"
 import { tmpdir } from "os"
 import * as path from "path"
-import { addBinExtension } from "../setup/setupBin"
+import { addBinExtension } from "../extension/extension"
 import { join } from "path"
 import spawn from "cross-spawn"
 
diff --git a/src/vcpkg/vcpkg.ts b/src/vcpkg/vcpkg.ts
index 7c70b3d2..868ad79f 100644
--- a/src/vcpkg/vcpkg.ts
+++ b/src/vcpkg/vcpkg.ts
@@ -3,6 +3,7 @@ import execa from "execa"
 import path from "path"
 import untildify from "untildify"
 import which from "which"
+import { addShellExtension } from "../utils/extension/extension"
 import { InstallationInfo } from "../utils/setup/setupBin"
 
 let hasVCPKG = false
@@ -12,7 +13,7 @@ export function setupVcpkg(_version: string, _setupCppDir: string, _arch: string
   if (!hasVCPKG || which.sync("vcpkg", { nothrow: true }) === null) {
     execa.sync("git", ["clone", "https://github.com/microsoft/vcpkg"], { cwd: untildify("~/") })
     const vcpkgDir = untildify("~/vcpkg")
-    execa.sync("./vcpkg/bootstrap-vcpkg", { cwd: vcpkgDir, shell: true })
+    execa.sync(addShellExtension("./vcpkg/bootstrap-vcpkg"), { cwd: vcpkgDir, shell: true })
     addPath(vcpkgDir)
     hasVCPKG = true
     return { binDir: vcpkgDir }