diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 725907a6..1aa73f7b 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -86,7 +86,8 @@ class Script(object):
             with open(path) as f:
                 source = f.read()
 
-        lines = common.splitlines(source)
+        self.source = common.source_to_unicode(source, encoding)
+        lines = common.splitlines(self.source)
         line = max(len(lines), 1) if line is None else line
         if not (0 < line <= len(lines)):
             raise ValueError('`line` parameter is not in a valid range.')
@@ -99,7 +100,6 @@ class Script(object):
 
         cache.clear_caches()
         debug.reset_time()
-        self.source = common.source_to_unicode(source, encoding)
         self._user_context = UserContext(self.source, self._pos)
         self._parser = UserContextParser(self.source, path, self._pos, self._user_context)
         self._evaluator = Evaluator()
diff --git a/jedi/cache.py b/jedi/cache.py
index 84f92c16..11c8f95e 100644
--- a/jedi/cache.py
+++ b/jedi/cache.py
@@ -100,9 +100,7 @@ def time_cache(time_add_setting):
 def cache_call_signatures(source, user_pos, stmt):
     """This function calculates the cache key."""
     index = user_pos[0] - 1
-    lines = source.splitlines() or ['']
-    if source and source[-1] == '\n':
-        lines.append('')
+    lines = common.splitlines(source)
 
     before_cursor = lines[index][:user_pos[1]]
     other_lines = lines[stmt.start_pos[0]:index]
diff --git a/jedi/parser/user_context.py b/jedi/parser/user_context.py
index 5fcbd1c3..4637039f 100644
--- a/jedi/parser/user_context.py
+++ b/jedi/parser/user_context.py
@@ -2,6 +2,7 @@ import re
 import os
 
 from jedi import cache
+from jedi import common
 from jedi.parser import tokenize
 from jedi._compatibility import u
 from jedi.parser.fast import FastParser
@@ -178,12 +179,7 @@ class UserContext(object):
 
     def get_line(self, line_nr):
         if not self._line_cache:
-            self._line_cache = self.source.splitlines()
-            if self.source:
-                if self.source[-1] == '\n':
-                    self._line_cache.append(u(''))
-            else:  # ''.splitlines() == []
-                self._line_cache = [u('')]
+            self._line_cache = common.splitlines(self.source)
 
         if line_nr == 0:
             # This is a fix for the zeroth line. We need a newline there, for
diff --git a/jedi/refactoring.py b/jedi/refactoring.py
index 726ff6fd..fbd9bde6 100644
--- a/jedi/refactoring.py
+++ b/jedi/refactoring.py
@@ -83,7 +83,7 @@ def _rename(names, replace_str):
                 with open(current_path) as f:
                     source = f.read()
 
-            new_lines = common.source_to_unicode(source).splitlines()
+            new_lines = common.splitlines(common.source_to_unicode(source))
             old_lines = new_lines[:]
 
         nr, indent = name.line, name.column
@@ -101,7 +101,7 @@ def extract(script, new_name):
     :type source: str
     :return: list of changed lines/changed files
     """
-    new_lines = common.source_to_unicode(script.source).splitlines()
+    new_lines = common.splitlines(common.source_to_unicode(script.source))
     old_lines = new_lines[:]
 
     user_stmt = script._parser.user_stmt()
@@ -160,7 +160,7 @@ def inline(script):
     """
     :type script: api.Script
     """
-    new_lines = common.source_to_unicode(script.source).splitlines()
+    new_lines = common.splitlines(common.source_to_unicode(script.source))
 
     dct = {}