diff --git a/CMakeLists.txt b/CMakeLists.txt
index de8f5b6..6f4b9ca 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,7 +9,9 @@ catkin_python_setup()
 
 catkin_package()
 
+catkin_install_python(PROGRAMS scripts/monitor
+  DESTINATION ${CATKIN_PACKAGE_BIN_DESTINATION})
+
 install(DIRECTORY launch
    DESTINATION ${CATKIN_PACKAGE_SHARE_DESTINATION}
 )
-
diff --git a/src/rosgraph_monitor/observer.py b/src/rosgraph_monitor/observer.py
index 9b39ccf..349510d 100644
--- a/src/rosgraph_monitor/observer.py
+++ b/src/rosgraph_monitor/observer.py
@@ -1,5 +1,4 @@
 import threading
-import mutex
 import rospy
 from diagnostic_msgs.msg import DiagnosticArray, DiagnosticStatus