diff --git a/src/lib/asiolink/asiolink.h b/src/lib/asiolink/asiolink.h
index 86c55dc758..251413ec04 100644
--- a/src/lib/asiolink/asiolink.h
+++ b/src/lib/asiolink/asiolink.h
@@ -84,4 +84,4 @@
 /// the placeholder of callback handlers:
 /// http://think-async.com/Asio/asio-1.3.1/doc/asio/reference/asio_handler_allocate.html
 
-#endif // __ASIOLINK_H
\ No newline at end of file
+#endif // __ASIOLINK_H
diff --git a/src/lib/asiolink/io_address.h b/src/lib/asiolink/io_address.h
index 07caafe524..d7598276bc 100644
--- a/src/lib/asiolink/io_address.h
+++ b/src/lib/asiolink/io_address.h
@@ -120,4 +120,4 @@ private:
 };
 
 }      // asiolink
-#endif // __IO_ADDRESS_H
\ No newline at end of file
+#endif // __IO_ADDRESS_H
diff --git a/src/lib/asiolink/io_endpoint.h b/src/lib/asiolink/io_endpoint.h
index 20bf0f84f4..2ec4083583 100644
--- a/src/lib/asiolink/io_endpoint.h
+++ b/src/lib/asiolink/io_endpoint.h
@@ -115,4 +115,4 @@ public:
 };
 
 }      // asiolink
-#endif // __IO_ENDPOINT_H
\ No newline at end of file
+#endif // __IO_ENDPOINT_H
diff --git a/src/lib/asiolink/tests/tcp_socket_unittest.cc b/src/lib/asiolink/tests/tcp_socket_unittest.cc
index cbaa2093df..11267c9a6b 100644
--- a/src/lib/asiolink/tests/tcp_socket_unittest.cc
+++ b/src/lib/asiolink/tests/tcp_socket_unittest.cc
@@ -511,4 +511,4 @@ TEST(TCPSocket, SequenceTest) {
     // Close client and server.
     EXPECT_NO_THROW(client.close());
     EXPECT_NO_THROW(server_socket.close());
-}
\ No newline at end of file
+}