diff --git a/flask_log_request_id/__init__.py b/flask_log_request_id/__init__.py
index 23accbd..30b6c12 100644
--- a/flask_log_request_id/__init__.py
+++ b/flask_log_request_id/__init__.py
@@ -4,7 +4,7 @@
 from . import parser
 
 
-__version__ = '0.9.3'
+__version__ = '0.9.4'
 
 
 __all__ = [
diff --git a/flask_log_request_id/request_id.py b/flask_log_request_id/request_id.py
index 695a61c..9f38ea0 100644
--- a/flask_log_request_id/request_id.py
+++ b/flask_log_request_id/request_id.py
@@ -81,7 +81,7 @@ def _persist_request_id():
                     setattr(g, g_object_attr, self._request_id_generator())
 
         # Register after request
-        if self.app.config['LOG_REQUEST_ID_LOG_ALL_REQUESTS']:
+        if app.config['LOG_REQUEST_ID_LOG_ALL_REQUESTS']:
             app.after_request(self._log_http_event)
 
     @staticmethod
diff --git a/tests/request_id_tests.py b/tests/request_id_tests.py
index b1c0d5c..fc61a77 100644
--- a/tests/request_id_tests.py
+++ b/tests/request_id_tests.py
@@ -12,6 +12,14 @@ def setUp(self):
         self.app.route('/')(lambda: 'hello world')
         self.app.testing = True
 
+    def test_lazy_initialization(self):
+        # Bug #38: https://github.com/Workable/flask-log-request-id/issues/38
+        request_id = RequestID()
+        request_id.init_app(self.app)
+        with self.app.test_request_context(headers={'X-Amzn-Trace-Id': 'Self=1-67891234-def;Root=1-67891233-abc'}):
+            self.app.preprocess_request()
+            self.assertEqual('1-67891234-def', current_request_id())
+
     def test_default_request_id_parser_with_amazon(self):
         RequestID(self.app)
         with self.app.test_request_context(headers={'X-Amzn-Trace-Id': 'Self=1-67891234-def;Root=1-67891233-abc'}):