diff --git a/packages/repack/src/commands/common/__tests__/resolveProjectPath.test.ts b/packages/repack/src/commands/common/__tests__/resolveProjectPath.test.ts
index 89d2e06c2..32e884ef7 100644
--- a/packages/repack/src/commands/common/__tests__/resolveProjectPath.test.ts
+++ b/packages/repack/src/commands/common/__tests__/resolveProjectPath.test.ts
@@ -1,12 +1,22 @@
+import path from 'node:path';
 import { resolveProjectPath } from '../resolveProjectPath.js';
 
 describe('resolveProjectPath', () => {
+  // The cases below are written with POSIX literals for readability.
+  // `resolveProjectPath` returns an absolute, platform-native path, so both the
+  // root and the expectation are run through `path.resolve` to give them a
+  // drive letter on Windows. Both calls are no-ops on POSIX.
+  // Resolving the root matters: without a drive, up-level navigation that
+  // reaches the root collapses to a bare "\\", which Windows then reads as the
+  // start of a UNC share rather than a local path.
   const expectResolved = (
     input: string,
     expected: string,
     root = '/project/root'
   ) => {
-    expect(resolveProjectPath(input, root)).toBe(expected);
+    expect(resolveProjectPath(input, path.resolve(root))).toBe(
+      path.resolve(expected)
+    );
   };
 
   it('should resolve [projectRoot] prefix correctly', () => {
diff --git a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
index f93c32447..cf616df91 100644
--- a/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
+++ b/packages/repack/src/plugins/__tests__/HermesBytecodePlugin.test.ts
@@ -1,5 +1,6 @@
 import fs from 'node:fs';
 import os from 'node:os';
+import path from 'node:path';
 import { type Compiler, ModuleFilenameHelpers } from '@rspack/core';
 import execa from 'execa';
 import { HermesBytecodePlugin } from '../HermesBytecodePlugin/index.js';
@@ -108,7 +109,7 @@ describe('HermesBytecodePlugin', () => {
 
       expect(execaNodeMock).toHaveBeenCalledTimes(1);
       expect(execaNodeMock.mock.calls[0][0]).toEqual(
-        'path/to/react-native/scripts/compose-source-maps.js'
+        path.join('path/to/react-native/scripts/compose-source-maps.js')
       );
     });
 
@@ -156,7 +157,7 @@ describe('HermesBytecodePlugin', () => {
       const hermesPath = getHermesCLIPath(reactNativePath);
 
       expect(hermesPath).toBe(
-        'path/to/hermes-compiler/hermesc/osx-bin/hermesc'
+        path.join('path/to/hermes-compiler/hermesc/osx-bin/hermesc')
       );
     });
 
@@ -167,7 +168,7 @@ describe('HermesBytecodePlugin', () => {
       const hermesPath = getHermesCLIPath(reactNativePath);
 
       expect(hermesPath).toBe(
-        'path/to/react-native/sdks/hermesc/osx-bin/hermesc'
+        path.join('path/to/react-native/sdks/hermesc/osx-bin/hermesc')
       );
     });
   });