diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 19c43476..0ffce5bf 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -124,7 +124,9 @@ class Script(object):
 
         cache.clear_time_caches()
         debug.reset_time()
-        self._grammar = parso.load_grammar(version='%s.%s' % sys.version_info[:2])
+
+        # Load the Python grammar of the current interpreter.
+        self._grammar = parso.load_grammar()
         if sys_path is None:
             venv = os.getenv('VIRTUAL_ENV')
             if venv:
diff --git a/jedi/evaluate/__init__.py b/jedi/evaluate/__init__.py
index 0f5e094d..8f23ffe9 100644
--- a/jedi/evaluate/__init__.py
+++ b/jedi/evaluate/__init__.py
@@ -89,7 +89,7 @@ from jedi import parser_utils
 class Evaluator(object):
     def __init__(self, grammar, sys_path=None):
         self.grammar = grammar
-        self.latest_grammar = parso.load_grammar('3.6')
+        self.latest_grammar = parso.load_grammar(version='3.6')
         self.memoize_cache = {}  # for memoize decorators
         # To memorize modules -> equals `sys.modules`.
         self.modules = {}  # like `sys.modules`.