diff --git a/jedi/api/__init__.py b/jedi/api/__init__.py
index 4cc94342..946f2c83 100644
--- a/jedi/api/__init__.py
+++ b/jedi/api/__init__.py
@@ -707,7 +707,7 @@ class Interpreter(Script):
     """
     _allow_descriptor_getattr_default = True
 
-    def __init__(self, code, namespaces, **kwds):
+    def __init__(self, code, namespaces, *, project=None, **kwds):
         try:
             namespaces = [dict(n) for n in namespaces]
         except Exception:
@@ -720,8 +720,11 @@ class Interpreter(Script):
             if not isinstance(environment, InterpreterEnvironment):
                 raise TypeError("The environment needs to be an InterpreterEnvironment subclass.")
 
-        super().__init__(code, environment=environment,
-                         project=Project(Path.cwd()), **kwds)
+        if project is None:
+            project = Project(Path.cwd())
+
+        super().__init__(code, environment=environment, project=project, **kwds)
+
         self.namespaces = namespaces
         self._inference_state.allow_descriptor_getattr = self._allow_descriptor_getattr_default