diff --git a/diagnostic_common_diagnostics/src/diagnostic_common_diagnostics/ntp_monitor.py b/diagnostic_common_diagnostics/src/diagnostic_common_diagnostics/ntp_monitor.py
index aefcc161b..5eaa41b5b 100755
--- a/diagnostic_common_diagnostics/src/diagnostic_common_diagnostics/ntp_monitor.py
+++ b/diagnostic_common_diagnostics/src/diagnostic_common_diagnostics/ntp_monitor.py
@@ -115,7 +115,7 @@ def __init__(self, ntp_hostname, offset=500, self_offset=500,
         self.self_stat.values = []
 
         self.mutex = threading.Lock()
-        self.pub = rospy.Publisher("/diagnostics", DIAG.DiagnosticArray)
+        self.pub = rospy.Publisher("/diagnostics", DIAG.DiagnosticArray, queue_size=10)
 
         # we need to periodically republish this
         self.current_msg = None