diff --git a/packages/core/src/utils/helper.ts b/packages/core/src/utils/helper.ts
index 1393533df..b4d433527 100644
--- a/packages/core/src/utils/helper.ts
+++ b/packages/core/src/utils/helper.ts
@@ -78,7 +78,12 @@ async function calcLongestCommonPath(
     return null;
   }
 
-  const splitPaths = absPaths.map((p) => p.split(path.posix.sep));
+  // we support two cases
+  // 1. /packages-a/src/index.ts
+  // 2. D:/packages-a/src/index.ts
+  const sep = path.posix.sep as '/';
+
+  const splitPaths = absPaths.map((p) => p.split(sep));
   let lcaFragments = splitPaths[0]!;
   for (let i = 1; i < splitPaths.length; i++) {
     const currentPath = splitPaths[i]!;
@@ -92,7 +97,7 @@ async function calcLongestCommonPath(
     lcaFragments = lcaFragments.slice(0, j);
   }
 
-  let lca = lcaFragments.length > 0 ? lcaFragments.join(path.sep) : '/';
+  let lca = lcaFragments.length > 0 ? lcaFragments.join(sep) : sep;
 
   const stats = await fsP.stat(lca);
   if (stats?.isFile()) {
diff --git a/packages/core/tests/lcp.test.ts b/packages/core/tests/lcp.test.ts
index 065a0f793..8283538c1 100644
--- a/packages/core/tests/lcp.test.ts
+++ b/packages/core/tests/lcp.test.ts
@@ -29,11 +29,11 @@ describe('LCP calculate correctly', () => {
       expect(result).toEqual('/Users/Someone/project-a/src');
     } else {
       const result = await calcLongestCommonPath([
-        'D:\\Users\\Someone\\project-a\\src\\helpers',
-        'D:\\Users\\Someone\\project-a\\src',
-        'D:\\Users\\Someone\\project-a\\src\\utils',
+        'D:/Users/Someone/project-a/src/helpers',
+        'D:/Users/Someone/project-a/src',
+        'D:/Users/Someone/project-a/src/utils',
       ]);
-      expect(result).toEqual('D:\\Users\\Someone\\project-a\\src');
+      expect(result).toEqual('D:/Users/Someone/project-a/src');
     }
   });
 
@@ -49,11 +49,11 @@ describe('LCP calculate correctly', () => {
       expect(result).toEqual('/Users/Someone/project-monorepo');
     } else {
       const result = await calcLongestCommonPath([
-        'D:\\Users\\Someone\\project-monorepo\\packages-a\\src\\index.ts',
-        'D:\\Users\\Someone\\project-monorepo\\packages-util\\src\\index.js',
-        'D:\\Users\\Someone\\project-monorepo\\script.js',
+        'D:/Users/Someone/project-monorepo/packages-a/src/index.ts',
+        'D:/Users/Someone/project-monorepo/packages-util/src/index.js',
+        'D:/Users/Someone/project-monorepo/script.js',
       ]);
-      expect(result).toEqual('D:\\Users\\Someone\\project-monorepo');
+      expect(result).toEqual('D:/Users/Someone/project-monorepo');
     }
   });
 
@@ -68,9 +68,9 @@ describe('LCP calculate correctly', () => {
       expect(result).toEqual('/Users/Someone/project/src');
     } else {
       const result = await calcLongestCommonPath([
-        'D:\\Users\\Someone\\project\\src\\index.js',
+        'D:/Users/Someone/project/src/index.js',
       ]);
-      expect(result).toEqual('D:\\Users\\Someone\\project\\src');
+      expect(result).toEqual('D:/Users/Someone/project/src');
     }
   });
 });