diff --git a/buoy_api_py/buoy_api/interface.py b/buoy_api_py/buoy_api/interface.py
index 7355881..2961a13 100644
--- a/buoy_api_py/buoy_api/interface.py
+++ b/buoy_api_py/buoy_api/interface.py
@@ -154,7 +154,7 @@ def __init__(self, node_name, wait_for_services=False, check_for_services=True,
             if not found and wait_for_services:
                 while rclpy.ok() and not self.wait_for_services():
                     pass
-            self.get_logger().info("Found all required services.")
+            self.get_logger().info('Found all required services.')
 
     def wait_for_services(self):
         # TODO(andermi)