diff --git a/index.js b/index.js
index f913a8c..a509728 100644
--- a/index.js
+++ b/index.js
@@ -55,7 +55,7 @@ module.exports = (options, callback) => {
         const iMap = JSON.parse(css.sourceMap);
         const oMap = Object.assign({}, iMap, {
           file: path.relative(file.base, file.path),
-          sources: iMap.sources.map(() => path.relative(file.base, file.path))
+          sources: iMap.sources.map(mapSrc => path.relative(file.base, mapSrc))
         });
         applySourceMap(file, oMap);
       }
diff --git a/index.spec.js b/index.spec.js
index 4dd0e68..9587a70 100644
--- a/index.spec.js
+++ b/index.spec.js
@@ -262,6 +262,24 @@ describe('gulp-clean-css: base functionality', () => {
         done();
       });
   })
+
+  it('should write sourcemaps, correct source path', done => {
+    let maps = {};
+    gulp.src(['test/fixtures/sourcemaps-import/styles/main.css'], {base: 'test/fixtures/sourcemaps-import/styles'})
+      .pipe(sourcemaps.init())
+      .pipe(cleanCSS())
+      .pipe(sourcemaps.mapSources(function (sourcePath, file) {
+        maps[sourcePath] = true;
+        return sourcePath;
+      }))
+      .pipe(sourcemaps.write('./', {sourceRoot: '/'}))
+      .pipe(gulp.dest('test/fixtures/sourcemaps-import'))
+      .once('end', () => {
+        maps['main.css'].should.be.true;
+        maps['partial.css'].should.be.true;
+        done();
+      });
+  });
 });
 
 describe('gulp-clean-css: rebase', () => {
diff --git a/package.json b/package.json
index 25ba355..f8cefc6 100644
--- a/package.json
+++ b/package.json
@@ -2,7 +2,7 @@
   "name": "gulp-clean-css",
   "description": "Minify css with clean-css.",
   "homepage": "https://github.com/scniro/gulp-clean-css#readme",
-  "version": "4.1.0",
+  "version": "4.1.1",
   "author": "scniro",
   "license": "MIT",
   "bugs": {
diff --git a/test/fixtures/sourcemaps-import/main.css b/test/fixtures/sourcemaps-import/main.css
new file mode 100644
index 0000000..01aee01
--- /dev/null
+++ b/test/fixtures/sourcemaps-import/main.css
@@ -0,0 +1,2 @@
+div{color:red}div{margin:10}
+/*# sourceMappingURL=main.css.map */
diff --git a/test/fixtures/sourcemaps-import/main.css.map b/test/fixtures/sourcemaps-import/main.css.map
new file mode 100644
index 0000000..6687fa7
--- /dev/null
+++ b/test/fixtures/sourcemaps-import/main.css.map
@@ -0,0 +1 @@
+{"version":3,"sources":["partial.css","main.css"],"names":[],"mappings":"AAAA,IACE,MAAM,ICCR,IACE,OAAO","file":"main.css","sourceRoot":"/","sourcesContent":["div {\n  color:red;\n}\n","@import(partial.css);\n\ndiv {\n  margin:10;\n}\n"]}
\ No newline at end of file
diff --git a/test/fixtures/sourcemaps-import/styles/main.css b/test/fixtures/sourcemaps-import/styles/main.css
new file mode 100644
index 0000000..bd55143
--- /dev/null
+++ b/test/fixtures/sourcemaps-import/styles/main.css
@@ -0,0 +1,5 @@
+@import(partial.css);
+
+div {
+  margin:10;
+}
diff --git a/test/fixtures/sourcemaps-import/styles/partial.css b/test/fixtures/sourcemaps-import/styles/partial.css
new file mode 100644
index 0000000..c475eb3
--- /dev/null
+++ b/test/fixtures/sourcemaps-import/styles/partial.css
@@ -0,0 +1,3 @@
+div {
+  color:red;
+}