diff --git a/src/index.js b/src/index.js
index 36c3d641..f129a0b1 100644
--- a/src/index.js
+++ b/src/index.js
@@ -3,7 +3,6 @@ const loaderUtils = require("loader-utils");
 const path = require("path");
 const cache = require("./fs-cache.js");
 const exists = require("./utils/exists");
-const relative = require("./utils/relative");
 const read = require("./utils/read");
 const resolveRc = require("./resolve-rc.js");
 const pkg = require("../package.json");
@@ -143,7 +142,7 @@ module.exports = function(source, inputSourceMap) {
   }
 
   if (options.sourceFileName === undefined) {
-    options.sourceFileName = relative(options.sourceRoot, options.filename);
+    options.sourceFileName = options.filename;
   }
 
   const cacheDirectory = options.cacheDirectory;
diff --git a/src/utils/relative.js b/src/utils/relative.js
deleted file mode 100644
index 377b969a..00000000
--- a/src/utils/relative.js
+++ /dev/null
@@ -1,13 +0,0 @@
-const path = require("path");
-
-module.exports = function relative(sourceRoot, filename) {
-  const rootPath = sourceRoot.replace(/\\/g, "/").split("/")[1];
-  const fileRootPath = filename.replace(/\\/g, "/").split("/")[1];
-
-  // If the file is in a completely different root folder use the absolute path of file.
-  if (rootPath && rootPath !== fileRootPath) {
-    return filename;
-  }
-
-  return path.relative(sourceRoot, filename);
-};
diff --git a/test/utils/relative.test.js b/test/utils/relative.test.js
deleted file mode 100644
index 96183b2d..00000000
--- a/test/utils/relative.test.js
+++ /dev/null
@@ -1,37 +0,0 @@
-import test from "ava";
-import os from "os";
-import relative from "../../lib/utils/relative.js";
-
-if (os.platform() === "win32") {
-  test("should get correct relative path - depth 0 - windows", t => {
-    t.is(relative("C:\\the\\root", "C:\\the\\root\\one.js"), "one.js");
-  });
-
-  test("should get correct relative path - depth 1 - windows", t => {
-    t.is(relative("C:\\the\\root", "C:\\the\\rootone.js"), "..\\rootone.js");
-  });
-
-  test("should get correct relative path - depth 2 - windows", t => {
-    t.is(relative("C:\\the\\root", "C:\\therootone.js"), "C:\\therootone.js");
-  });
-
-  test("should get correct relative path with main root - depth 0 - windows", t => {
-    t.is(relative("C:\\", "C:\\the\\root\\one.js"), "the\\root\\one.js");
-  });
-} else {
-  test("should get correct relative path - depth 0", t => {
-    t.is(relative("/the/root", "/the/root/one.js"), "one.js");
-  });
-
-  test("should get correct relative path - depth 1", t => {
-    t.is(relative("/the/root", "/the/rootone.js"), "../rootone.js");
-  });
-
-  test("should get correct relative path - depth 2", t => {
-    t.is(relative("/the/root", "/therootone.js"), "/therootone.js");
-  });
-
-  test("should get correct relative path with main root - depth 0", t => {
-    t.is(relative("/", "/the/root/one.js"), "the/root/one.js");
-  });
-}