diff --git a/node_modules/cool-styles/bar.css b/node_modules/cool-styles/bar.css
new file mode 100644
index 0000000..71c33de
--- /dev/null
+++ b/node_modules/cool-styles/bar.css
@@ -0,0 +1,4 @@
+.example
+{
+  background: #F00;
+}
diff --git a/node_modules/cool-styles/foo.css b/node_modules/cool-styles/foo.css
index 65f95db..e584fbf 100644
--- a/node_modules/cool-styles/foo.css
+++ b/node_modules/cool-styles/foo.css
@@ -1,3 +1,4 @@
 .example {
   color: #F00;
+  composes: example from './bar.css';
 }
diff --git a/package.json b/package.json
index ecec1f9..649518f 100644
--- a/package.json
+++ b/package.json
@@ -6,6 +6,9 @@
   "directories": {
     "test": "test"
   },
+  "engines": {
+    "node": ">=0.12"
+  },
   "dependencies": {
     "postcss": "^4.1.11",
     "postcss-modules-extract-imports": "^0.0.5",
diff --git a/src/file-system-loader.js b/src/file-system-loader.js
index 2a3f47d..4cf3d8e 100644
--- a/src/file-system-loader.js
+++ b/src/file-system-loader.js
@@ -33,26 +33,26 @@ export default class FileSystemLoader {
       trace = _trace || String.fromCharCode( this.importNr++ )
     return new Promise( ( resolve, reject ) => {
       let relativeDir = path.dirname( relativeTo ),
-        rootRelativePath = path.resolve( relativeDir, newPath ),
-        fileRelativePath = path.resolve( path.join( this.root, relativeDir ), newPath )
+        filename = path.resolve( this.root + relativeDir, newPath )
 
       // if the path is not relative or absolute, try to resolve it in node_modules
-      if (newPath[0] !== '.' && newPath[0] !== '/') {
+      if ( newPath[0] !== '.' && newPath[0] !== path.sep ) {
         try {
-          fileRelativePath = require.resolve(newPath);
+          filename = require.resolve( newPath );
         }
         catch (e) {}
       }
 
-      const tokens = this.tokensByFile[fileRelativePath]
-      if (tokens) { return resolve(tokens) }
+      const rootRelativePath = path.sep + path.relative( this.root, filename )
+      const tokens = this.tokensByFile[filename]
+      if ( tokens ) { return resolve( tokens ) }
 
-      fs.readFile( fileRelativePath, "utf-8", ( err, source ) => {
+      fs.readFile( filename, "utf-8", ( err, source ) => {
         if ( err ) reject( err )
         this.core.load( source, rootRelativePath, trace, this.fetch.bind( this ) )
           .then( ( { injectableSource, exportTokens } ) => {
             this.sources[trace] = injectableSource
-            this.tokensByFile[fileRelativePath] = exportTokens
+            this.tokensByFile[filename] = exportTokens
             resolve( exportTokens )
           }, reject )
       } )
diff --git a/test/test-cases/compose-node-module/expected.css b/test/test-cases/compose-node-module/expected.css
index 0667b94..20f498c 100644
--- a/test/test-cases/compose-node-module/expected.css
+++ b/test/test-cases/compose-node-module/expected.css
@@ -1,4 +1,7 @@
-._compose_node_module_cool_styles_foo__example {
+:import("./bar.css") {
+  i__imported_example_0: example;
+}
+._node_modules_cool_styles_foo__example {
   color: #F00;
 }
 ._compose_node_module_source__foo {
diff --git a/test/test-cases/compose-node-module/expected.json b/test/test-cases/compose-node-module/expected.json
index a57448c..0da68b2 100644
--- a/test/test-cases/compose-node-module/expected.json
+++ b/test/test-cases/compose-node-module/expected.json
@@ -1,3 +1,3 @@
 {
-  "foo": "_compose_node_module_source__foo _compose_node_module_cool_styles_foo__example"
+  "foo": "_compose_node_module_source__foo _node_modules_cool_styles_foo__example _node_modules_cool_styles_foo__example i__imported_example_0"
 }