diff --git a/lib/util.js b/lib/util.js
index f200754ba..18affb9a7 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -349,7 +349,11 @@ exports.getToolNames = getToolNames;
 // Mostly intended for use within tests.
 async function withTmpDir(body) {
     const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'codeql-action-'));
-    const result = await body(tmpDir);
+    const realSubdir = path.join(tmpDir, 'real');
+    fs.mkdirSync(realSubdir);
+    const symlinkSubdir = path.join(tmpDir, 'symlink');
+    fs.symlinkSync(realSubdir, symlinkSubdir, 'dir');
+    const result = await body(symlinkSubdir);
     fs.rmdirSync(tmpDir, { recursive: true });
     return result;
 }
diff --git a/lib/util.js.map b/lib/util.js.map
index 08dc109f2..515b4a712 100644
--- a/lib/util.js.map
+++ b/lib/util.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/src/util.ts b/src/util.ts
index a32bdac9b..c101ccc26 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -389,7 +389,11 @@ export function getToolNames(sarifContents: string): string[] {
 // Mostly intended for use within tests.
 export async function withTmpDir<T>(body: (tmpDir: string) => Promise<T>): Promise<T> {
   const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'codeql-action-'));
-  const result = await body(tmpDir);
+  const realSubdir = path.join(tmpDir, 'real');
+  fs.mkdirSync(realSubdir);
+  const symlinkSubdir = path.join(tmpDir, 'symlink');
+  fs.symlinkSync(realSubdir, symlinkSubdir, 'dir');
+  const result = await body(symlinkSubdir);
   fs.rmdirSync(tmpDir, { recursive: true });
   return result;
 }