diff --git a/sasstests.py b/sasstests.py
index f5210f94..6c8b3354 100644
--- a/sasstests.py
+++ b/sasstests.py
@@ -66,6 +66,11 @@
     font: '나눔고딕', sans-serif; }
 '''
 
+E_EXPECTED_CSS = '''\
+a {
+  color: red; }
+'''
+
 SUBDIR_RECUR_EXPECTED_CSS = '''\
 body p {
   color: blue; }
@@ -187,6 +192,8 @@ def test_compile_filename(self):
             self.assertEqual(D_EXPECTED_CSS, actual)
         else:
             self.assertEqual(D_EXPECTED_CSS.decode('utf-8'), actual)
+        actual = sass.compile(filename='test/e.scss')
+        assert actual == E_EXPECTED_CSS
         self.assertRaises(IOError, sass.compile,
                           filename='test/not-exist.sass')
         self.assertRaises(TypeError, sass.compile, filename=1234)
@@ -234,7 +241,7 @@ def test_builder_build_directory(self):
         css_path = os.path.join(temp_path, 'css')
         shutil.copytree('test', sass_path)
         result_files = build_directory(sass_path, css_path)
-        assert len(result_files) == 5
+        assert len(result_files) == 6
         assert result_files['a.scss'] == 'a.scss.css'
         with open(os.path.join(css_path, 'a.scss.css'), **utf8_if_py3) as f:
             css = f.read()
@@ -251,6 +258,10 @@ def test_builder_build_directory(self):
         with open(os.path.join(css_path, 'd.scss.css'), **utf8_if_py3) as f:
             css = f.read()
         self.assertEqual(D_EXPECTED_CSS, css)
+        assert result_files['e.scss'] == 'e.scss.css'
+        with open(os.path.join(css_path, 'e.scss.css'), **utf8_if_py3) as f:
+            css = f.read()
+        assert css == E_EXPECTED_CSS
         assert (result_files[os.path.join('subdir', 'recur.scss')] ==
                 os.path.join('subdir', 'recur.scss.css'))
         with open(os.path.join(css_path, 'subdir', 'recur.scss.css'),
diff --git a/sassutils/builder.py b/sassutils/builder.py
index 53d4554e..0ec45864 100644
--- a/sassutils/builder.py
+++ b/sassutils/builder.py
@@ -46,6 +46,9 @@ def build_directory(sass_path, css_path, _root_sass=None, _root_css=None):
     for name in os.listdir(sass_path):
         sass_fullname = os.path.join(sass_path, name)
         if SUFFIX_PATTERN.search(name) and os.path.isfile(sass_fullname):
+            if name[0] == '_':
+                # Do not compile if it's partial
+                continue
             css_fullname = os.path.join(css_path, name) + '.css'
             css = compile(filename=sass_fullname, include_paths=[_root_sass])
             with io.open(css_fullname, 'w', encoding='utf-8') as css_file:
diff --git a/test/_f.scss b/test/_f.scss
new file mode 100644
index 00000000..d01cad8d
--- /dev/null
+++ b/test/_f.scss
@@ -0,0 +1 @@
+$test-variable : true !default;
diff --git a/test/e.scss b/test/e.scss
new file mode 100644
index 00000000..005d3453
--- /dev/null
+++ b/test/e.scss
@@ -0,0 +1,2 @@
+@import "f";
+@import "subdir/sub";
diff --git a/test/subdir/_sub.scss b/test/subdir/_sub.scss
new file mode 100644
index 00000000..4ac2d132
--- /dev/null
+++ b/test/subdir/_sub.scss
@@ -0,0 +1,5 @@
+@if $test-variable == true {
+  a {
+    color: red;
+  }
+}