diff --git a/ChangeLog b/ChangeLog
index 77a8cc2c..2cefa7f8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -18373,3 +18373,6 @@
 	* Fixed regression in scheduler that caused events with two
 	scheduler codes to fail.
 	* Updated scheduler reports to indicate scheduler codes.
+2019-01-14 Patrick Linstruth <patrick@deltecent.com>
+	* Fixed a bug in RDLogManager that allowed cloned clock lines to pass
+	hour mark.
diff --git a/rdlogmanager/edit_clock.cpp b/rdlogmanager/edit_clock.cpp
index eb4a15b5..74fe614f 100644
--- a/rdlogmanager/edit_clock.cpp
+++ b/rdlogmanager/edit_clock.cpp
@@ -350,6 +350,9 @@ void EditClock::cloneData()
   eventline.setName(selectedEventLine->name());
   eventline.setStartTime(selectedEventLine->startTime().addMSecs(selectedEventLine->length()));
   eventline.setLength(selectedEventLine->length());
+  if(eventline.startTime().addMSecs(eventline.length()).hour()) {
+    eventline.setLength(0);
+  }
   
   EditEventLine *edit_eventline=
     new EditEventLine(&eventline,edit_clock,-1,this);