diff --git a/gramps/gui/widgets/grampletpane.py b/gramps/gui/widgets/grampletpane.py
index 6e2f1567a..d80c10797 100644
--- a/gramps/gui/widgets/grampletpane.py
+++ b/gramps/gui/widgets/grampletpane.py
@@ -1272,6 +1272,9 @@ class GrampletPane(Gtk.ScrolledWindow):
             mainframe = mframe.get_parent() # actually a vbox
         rect = source.get_allocation()
         sx, sy = rect.width, rect.height
+        # Convert to LTR co-ordinates when using RTL locale
+        if source.get_direction() == Gtk.TextDirection.RTL:
+            x = sx - x
         # first, find column:
         col = 0
         for i in range(len(self.columns)):