diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3f755829b..3408c5bd0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -128,6 +128,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Remove user from tags when deleting user [#1161](https://github.com/greenbone/gvmd/pull/1161)
 - Handle INTERRUPTED scans [#1146](https://github.com/greenbone/gvmd/pull/1146)
 - Check hosts in MODIFY_OVERRIDE, as in CREATE_OVERRIDE [#1162](https://github.com/greenbone/gvmd/pull/1162)
+- Preserve task "once" value [#1176](https://github.com/greenbone/gvmd/pull/1176)
 - Check number of args to ensure period_offsets is 0 [#1175](https://github.com/greenbone/gvmd/pull/1175)
 
 ### Removed
diff --git a/src/gmp.c b/src/gmp.c
index a545ebbd0..e5dea3182 100644
--- a/src/gmp.c
+++ b/src/gmp.c
@@ -16822,16 +16822,12 @@ get_task_schedule_xml (task_t task)
                            "<trash>%d</trash>"
                            "<icalendar>%s</icalendar>"
                            "<timezone>%s</timezone>"
-                           "</schedule>"
-                           "<schedule_periods>"
-                           "%d"
-                           "</schedule_periods>",
+                           "</schedule>",
                            task_schedule_uuid,
                            task_schedule_name,
                            schedule_in_trash,
                            icalendar ? icalendar : "",
-                           zone ? zone : "",
-                           task_schedule_periods (task));
+                           zone ? zone : "");
 
       g_free (icalendar);
       g_free (zone);
@@ -16848,6 +16844,12 @@ get_task_schedule_xml (task_t task)
                          schedule_in_trash);
     }
 
+  xml_string_append (xml,
+                     "<schedule_periods>"
+                     "%d"
+                     "</schedule_periods>",
+                     task_schedule_periods (task));
+
   return g_string_free (xml, FALSE);
 }
 
diff --git a/src/manage.c b/src/manage.c
index e39e02767..41203eb4e 100644
--- a/src/manage.c
+++ b/src/manage.c
@@ -7111,7 +7111,7 @@ scheduled_task_start (scheduled_task_t *scheduled_task,
                        * it from the task.  If it has a duration it
                        * will be removed by manage_schedule via
                        * clear_duration_schedules, after the duration. */
-                      set_task_schedule_uuid (task_uuid, 0, 0);
+                      set_task_schedule_uuid (task_uuid, 0, -1);
                     else if ((periods = task_schedule_periods_uuid
                                          (task_uuid)))
                       {
diff --git a/src/manage_sql.c b/src/manage_sql.c
index 6064e8443..a70292fc2 100644
--- a/src/manage_sql.c
+++ b/src/manage_sql.c
@@ -18234,27 +18234,35 @@ set_task_schedule (task_t task, schedule_t schedule, int periods)
  *
  * @param[in]  task_id   Task UUID.
  * @param[in]  schedule  Schedule.
- * @param[in]  periods   Number of schedule periods.
+ * @param[in]  periods   Number of schedule periods.  -1 to use existing value.
  *
  * @return 0 success, -1 error.
  */
 int
 set_task_schedule_uuid (const gchar *task_id, schedule_t schedule, int periods)
 {
-  gchar *quoted_task_id;
+  gchar *quoted_task_id, *schedule_periods;
+
+  if (periods == -1)
+    schedule_periods = g_strdup ("");
+  else
+    schedule_periods = g_strdup_printf ("schedule_periods = %i,",
+                                        periods);
 
   quoted_task_id = sql_quote (task_id);
   sql ("UPDATE tasks"
        " SET schedule = %llu,"
-       " schedule_periods = %i,"
+       "%s"
        " schedule_next_time = (SELECT next_time_ical (icalendar, timezone)"
        "                       FROM schedules"
        "                       WHERE id = %llu),"
        " modification_time = m_now ()"
        " WHERE uuid = '%s';",
-       schedule, periods, schedule, quoted_task_id);
+       schedule, schedule_periods, schedule, quoted_task_id);
   g_free (quoted_task_id);
 
+  g_free (schedule_periods);
+
   return 0;
 }