diff --git a/jedi/evaluate/compiled/subprocess/__init__.py b/jedi/evaluate/compiled/subprocess/__init__.py
index a8de8792..bc9abaf1 100644
--- a/jedi/evaluate/compiled/subprocess/__init__.py
+++ b/jedi/evaluate/compiled/subprocess/__init__.py
@@ -175,6 +175,7 @@ class _CompiledSubprocess(object):
                 del _subprocesses[self._executable]
 
         self._process.kill()
+        self._process.wait()
 
     def _send(self, evaluator_id, function, args=(), kwargs={}):
         if self._crashed: