diff --git a/tfw/components/pipe_io/pipe_connector/pipe_connector.py b/tfw/components/pipe_io/pipe_connector/pipe_connector.py
index 06ba4ab..6f76e0e 100644
--- a/tfw/components/pipe_io/pipe_connector/pipe_connector.py
+++ b/tfw/components/pipe_io/pipe_connector/pipe_connector.py
@@ -15,12 +15,12 @@ class PipeConnector:
 
     def __init__(self, path):
         self.recv_pipes, self.send_pipes = {}, {}
-        self.observer = self.build_observer(path)
+        self.observer = self._build_observer(path)
         self.observer.on_any_event = self._on_any_event
         self.observer.start()
         self._connect_existing_pipes(path)
 
-    def build_observer(self, path): # pylint: disable=no-self-use
+    def _build_observer(self, path): # pylint: disable=no-self-use
         if not exists(path):
             mkdir(path)
         if not access(path, R_OK):
diff --git a/tfw/components/pipe_io/pipe_connector/test_proxy_pipe_connector.py b/tfw/components/pipe_io/pipe_connector/test_proxy_pipe_connector.py
index e49f7cc..989c5bf 100644
--- a/tfw/components/pipe_io/pipe_connector/test_proxy_pipe_connector.py
+++ b/tfw/components/pipe_io/pipe_connector/test_proxy_pipe_connector.py
@@ -43,7 +43,7 @@ class MockPipeConnector(ProxyPipeConnector):
         self.reader_events, self.writer_events = [], []
         super().__init__(path, connector)
 
-    def build_observer(self, path):
+    def _build_observer(self, path):
         return MockObserver()
 
     def build_reader(self, path):