diff --git a/.changeset/late-badgers-do.md b/.changeset/late-badgers-do.md
new file mode 100644
index 0000000000..56bff9b376
--- /dev/null
+++ b/.changeset/late-badgers-do.md
@@ -0,0 +1,6 @@
+---
+"@medusajs/client-types": patch
+"@medusajs/medusa-oas-cli": patch
+---
+
+Add separator after tmpdir base
diff --git a/packages/generated/client-types/scripts/build.ts b/packages/generated/client-types/scripts/build.ts
index df7bb096f2..30b4435560 100644
--- a/packages/generated/client-types/scripts/build.ts
+++ b/packages/generated/client-types/scripts/build.ts
@@ -2,6 +2,7 @@ import execa from "execa"
 import os from "os"
 import fs from "fs/promises"
 import path from "path"
+import { sep } from "path"
 
 const basePath = path.resolve(__dirname, `../`)
 
@@ -51,7 +52,7 @@ const getTmpDirectory = async () => {
    * RUNNER_TEMP: GitHub action, the path to a temporary directory on the runner.
    */
   const tmpDir = process.env["RUNNER_TEMP"] ?? os.tmpdir()
-  return await fs.mkdtemp(tmpDir)
+  return await fs.mkdtemp(`${tmpDir}${sep}`)
 }
 
 void (async () => {
diff --git a/packages/oas/medusa-oas-cli/src/utils/fs-utils.ts b/packages/oas/medusa-oas-cli/src/utils/fs-utils.ts
index 65c866676c..e7f19a1dd2 100644
--- a/packages/oas/medusa-oas-cli/src/utils/fs-utils.ts
+++ b/packages/oas/medusa-oas-cli/src/utils/fs-utils.ts
@@ -1,5 +1,6 @@
 import { access, lstat, mkdtemp } from "fs/promises"
 import path from "path"
+import { sep } from "path"
 import { tmpdir } from "os"
 
 export async function isFile(filePath: string): Promise<boolean> {
@@ -25,5 +26,5 @@ export const getTmpDirectory = async () => {
    * RUNNER_TEMP: GitHub action, the path to a temporary directory on the runner.
    */
   const tmpDir = process.env["RUNNER_TEMP"] ?? tmpdir()
-  return await mkdtemp(tmpDir)
+  return await mkdtemp(`${tmpDir}${sep}`)
 }