diff --git a/ChangeLog b/ChangeLog
index 465f91c1..85bd8b9b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -15916,3 +15916,6 @@
 	* Fixed a bug in 'lib/rdevent_line.cpp' that caused an embedded traffic
 	import event to be assigned incorrect link parameters when scheduled
 	at midnight.
+2017-08-01 Fred Gleason <fredg@paravelsystems.com>
+	* Fixed a bug in 'rdlogmanager/edit_grid.cpp' to broke functioning of
+	the 'Clear Hour' item in the right-click menu.
diff --git a/rdlogmanager/edit_grid.cpp b/rdlogmanager/edit_grid.cpp
index 4ffd6209..272c736d 100644
--- a/rdlogmanager/edit_grid.cpp
+++ b/rdlogmanager/edit_grid.cpp
@@ -264,9 +264,10 @@ void EditGrid::clearHourData()
 {
   int dayofweek=edit_rightclick_id/24+1;
   int hour=edit_rightclick_id-24*(dayofweek-1);
+
   QString sql=QString("update SERVICE_CLOCKS set CLOCK_NAME=null where ")+
     "(SERVICE_NAME=\""+RDEscapeString(edit_servicename)+"\")&&"+
-    QString().sprintf("HOUR=%d)",hour);
+    QString().sprintf("(HOUR=%d)",(dayofweek-1)*24+hour);
   RDSqlQuery *q=new RDSqlQuery(sql);
   delete q;
   LabelButton(dayofweek,hour,"");