diff --git a/src/gcal-days-grid.c b/src/gcal-days-grid.c
index 9693807b..96adc9d1 100644
--- a/src/gcal-days-grid.c
+++ b/src/gcal-days-grid.c
@@ -854,6 +854,8 @@ gcal_days_grid_button_release_event (GtkWidget      *widget,
   gint height_block;
   gint left_pad;
 
+  gint cell_temp;
+
   priv = gcal_days_grid_get_instance_private (GCAL_DAYS_GRID (widget));
 
   if (priv->clicked_cell == -1)
@@ -879,6 +881,13 @@ gcal_days_grid_button_release_event (GtkWidget      *widget,
 
   gtk_widget_queue_draw (widget);
 
+  if (priv->start_mark_cell > priv->end_mark_cell)
+    {
+      cell_temp = priv->end_mark_cell;
+      priv->end_mark_cell = priv->start_mark_cell;
+      priv->start_mark_cell = cell_temp;
+    }
+
   g_signal_emit (GCAL_DAYS_GRID (widget),
                  signals[MARKED], 0,
                  priv->start_mark_cell, priv->end_mark_cell);