diff --git a/src/core/load-sources.ts b/src/core/load-sources.ts
index 8df242a..3d8abda 100644
--- a/src/core/load-sources.ts
+++ b/src/core/load-sources.ts
@@ -1,7 +1,7 @@
 import glob from 'fast-glob'
 
 import { Platforms, platforms } from '../core/platforms'
-import { getPlatformFromFilePath, flatten } from './utils'
+import { getPlatformFromFilePath, flatten, normalizePaths } from './utils'
 
 export async function loadSources(paths: string[][], platform: Platforms): Promise<string[]> {
   const levels = platforms.get(platform)
@@ -12,7 +12,10 @@ export async function loadSources(paths: string[][], platform: Platforms): Promi
 
   // Uses nested array with paths, cuz glob not save orders with using patterns for path.
   // Also uses sort after glob for idempotent result.
-  const result = flatten(await Promise.all(paths.map((path) => glob.sync(path).sort())))
+  const resolvedPaths = await Promise.all(
+    paths.map((path) => glob.sync(normalizePaths(path)).sort()),
+  )
+  const result = flatten(resolvedPaths)
     .filter((file) => {
       const filePlatform = getPlatformFromFilePath(file)
       return levels.includes(filePlatform)
diff --git a/src/core/load-theme.ts b/src/core/load-theme.ts
index 6b196ac..22a5e56 100644
--- a/src/core/load-theme.ts
+++ b/src/core/load-theme.ts
@@ -5,7 +5,7 @@ import glob from 'fast-glob'
 import pkgDir from 'pkg-dir'
 
 import { Platforms } from './platforms'
-import { throwError } from './utils'
+import { throwError, normalizePaths } from './utils'
 
 type InputTheme = {
   mappers: string[]
@@ -31,10 +31,9 @@ export async function loadTheme(
   const theme: InputTheme = await readJSON(sources)
 
   if (theme.extends !== undefined) {
-    const [extendsPath] = await glob([
-      resolve(cwd, 'node_modules', theme.extends),
-      resolve(cwd, theme.extends),
-    ])
+    const [extendsPath] = await glob(
+      normalizePaths([resolve(cwd, 'node_modules', theme.extends), resolve(cwd, theme.extends)]),
+    )
 
     if (extendsPath === undefined) {
       throwError(`Cannot load theme: "${theme.extends}".`)
diff --git a/src/core/mappers.ts b/src/core/mappers.ts
index aa1df97..f0c168c 100644
--- a/src/core/mappers.ts
+++ b/src/core/mappers.ts
@@ -2,9 +2,11 @@ import glob from 'fast-glob'
 import { readJSON, readFileSync } from 'fs-extra'
 import YAML from 'yaml'
 
-export async function loadMappers(path: string[]): Promise<any> {
+import { normalizePaths } from './utils'
+
+export async function loadMappers(paths: string[]): Promise<any> {
   const result = {}
-  for (const file of await glob(path)) {
+  for (const file of await glob(normalizePaths(paths))) {
     if (/\.ya?ml$/.test(file)) {
       Object.assign(result, YAML.parse(await readFileSync(file, 'utf8')))
     } else {
diff --git a/src/core/utils.ts b/src/core/utils.ts
index 74c4081..3b3f6de 100644
--- a/src/core/utils.ts
+++ b/src/core/utils.ts
@@ -1,3 +1,5 @@
+import normalize from 'normalize-path'
+
 import { Platforms } from '../core/platforms'
 
 export function throwError(messag: string): void {
@@ -38,3 +40,7 @@ type ArrayType<T> = T extends (infer U)[] ? U : never
 export function flatten<T extends any[]>(arrays: T[]): ArrayType<T>[] {
   return arrays.reduce<any[]>((acc, value) => acc.concat(value), [])
 }
+
+export function normalizePaths(paths: string[]): string[] {
+  return paths.map((path) => normalize(path))
+}