diff --git a/lib/core-client/package.json b/lib/core-client/package.json
index fa2ad7e5e71e..255395ffb8b8 100644
--- a/lib/core-client/package.json
+++ b/lib/core-client/package.json
@@ -54,7 +54,7 @@
     "lodash": "^4.17.20",
     "qs": "^6.10.0",
     "regenerator-runtime": "^0.13.7",
-    "slash": "^4.0.0",
+    "slash": "^3.0.0",
     "ts-dedent": "^2.0.0",
     "unfetch": "^4.2.0",
     "util-deprecate": "^1.0.2"
diff --git a/lib/core-client/src/preview/autoTitle.test.ts b/lib/core-client/src/preview/autoTitle.test.ts
index baa197de4599..2efc491b9239 100644
--- a/lib/core-client/src/preview/autoTitle.test.ts
+++ b/lib/core-client/src/preview/autoTitle.test.ts
@@ -50,7 +50,7 @@ describe('autoTitle', () => {
 
     it('match with windows path', () => {
       expect(
-        auto('/path/to_my/file', { glob: '', specifier: { directory: '.\\path' } })
+        auto('/path/to_my/file', { glob: '', specifier: { directory: '\\path' } })
       ).toMatchInlineSnapshot(`To My/File`);
     });
   });
@@ -94,7 +94,7 @@ describe('autoTitle', () => {
 
     it('match with windows path', () => {
       expect(
-        auto('/path/to_my/file', { glob: '', specifier: { directory: '.\\path\\' } })
+        auto('/path/to_my/file', { glob: '', specifier: { directory: '\\path\\' } })
       ).toMatchInlineSnapshot(`To My/File`);
     });
   });
diff --git a/lib/core-client/src/preview/autoTitle.ts b/lib/core-client/src/preview/autoTitle.ts
index 1f04ee4da5c3..b5a98a93b28b 100644
--- a/lib/core-client/src/preview/autoTitle.ts
+++ b/lib/core-client/src/preview/autoTitle.ts
@@ -35,12 +35,13 @@ export const autoTitleFromEntry = (fileName: string, entry: NormalizedStoriesEnt
   const { directory, titlePrefix = '' } = entry.specifier || {};
   // On Windows, backslashes are used in paths, which can cause problems here
   // slash makes sure we always handle paths with unix-style forward slash
-  const normalizedDirectory = slash(directory);
+  const normalizedDirectory = directory && slash(directory);
   const normalizedFileName = slash(fileName);
 
   if (normalizedFileName.startsWith(normalizedDirectory)) {
     const suffix = normalizedFileName.replace(normalizedDirectory, '');
-    return startCaseTitle(stripExtension(path.join(titlePrefix, suffix)));
+    const titleAndSuffix = slash(path.join(titlePrefix, suffix));
+    return startCaseTitle(stripExtension(titleAndSuffix));
   }
   return undefined;
 };
diff --git a/lib/core-common/src/utils/es6Transpiler.ts b/lib/core-common/src/utils/es6Transpiler.ts
index 70efb4c442fb..c1e679bd2e3d 100644
--- a/lib/core-common/src/utils/es6Transpiler.ts
+++ b/lib/core-common/src/utils/es6Transpiler.ts
@@ -9,12 +9,11 @@ const nodeModulesThatNeedToBeParsedBecauseTheyExposeES6 = [
   'node_modules/highlight.js',
   'node_modules/json5',
   'node_modules/semver',
-  'node_modules/slash',
 ];
 
 export const es6Transpiler: () => RuleSetRule = () => {
   // TODO: generate regexp using are-you-es5
-
+  console.log('es6Transpiler');
   const include = (input: string) => {
     return (
       !!nodeModulesThatNeedToBeParsedBecauseTheyExposeES6.find((p) => input.includes(p)) ||
diff --git a/yarn.lock b/yarn.lock
index 8f9cc768a9ca..a0055d13ff4b 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6897,7 +6897,7 @@ __metadata:
     lodash: ^4.17.20
     qs: ^6.10.0
     regenerator-runtime: ^0.13.7
-    slash: ^4.0.0
+    slash: ^3.0.0
     ts-dedent: ^2.0.0
     unfetch: ^4.2.0
     util-deprecate: ^1.0.2
@@ -39038,13 +39038,6 @@ resolve@1.19.0:
   languageName: node
   linkType: hard
 
-"slash@npm:^4.0.0":
-  version: 4.0.0
-  resolution: "slash@npm:4.0.0"
-  checksum: b522ca75d80d107fd30d29df0549a7b2537c83c4c4ecd12cd7d4ea6c8aaca2ab17ada002e7a1d78a9d736a0261509f26ea5b489082ee443a3a810586ef8eff18
-  languageName: node
-  linkType: hard
-
 "slice-ansi@npm:0.0.4":
   version: 0.0.4
   resolution: "slice-ansi@npm:0.0.4"