diff --git a/jedi/evaluate/sys_path.py b/jedi/evaluate/sys_path.py
index 4a6fd6ca..9e967698 100644
--- a/jedi/evaluate/sys_path.py
+++ b/jedi/evaluate/sys_path.py
@@ -209,7 +209,8 @@ def transform_path_to_dotted(sys_path, module_path):
     """
     Returns the dotted path inside a sys.path as a list of names. e.g.
 
-    >>> transform_path_to_dotted(["/foo"], '/foo/bar/baz.py')
+    >>> from os.path import abspath
+    >>> transform_path_to_dotted([abspath("/foo")], abspath('/foo/bar/baz.py'))
     (('bar', 'baz'), False)
 
     Returns (None, False) if the path doesn't really resolve to anything.
diff --git a/test/test_evaluate/test_sys_path.py b/test/test_evaluate/test_sys_path.py
index d3e38ce5..18820751 100644
--- a/test/test_evaluate/test_sys_path.py
+++ b/test/test_evaluate/test_sys_path.py
@@ -93,5 +93,5 @@ _s = ['/a', '/b', '/c/d/']
         (['/foo'], '/foo/bar.xyz', ('bar.xyz',), False),
     ])
 def test_calculate_dotted_from_path(sys_path_, module_path, expected, is_package):
-    assert sys_path.transform_path_to_dotted(sys_path_, module_path) \
-        == (expected, is_package)
+    # tranform_path_to_dotted expects normalized absolute paths.
+    sys_path_ = [os.path.abspath(path) for path in sys_path_]