diff --git a/src/pyj/select.pyj b/src/pyj/select.pyj
index be23ba2f92..35102bf199 100644
--- a/src/pyj/select.pyj
+++ b/src/pyj/select.pyj
@@ -186,6 +186,8 @@ def move_end_of_selection(pos, start):
     if p:
         r = sel.getRangeAt(0)
         if start:
-            r.setStart(p.offsetNode, p.offset)
+            if r.startContainer is not p.offsetNode or r.startOffset is not p.offset:
+                r.setStart(p.offsetNode, p.offset)
         else:
-            r.setEnd(p.offsetNode, p.offset)
+            if r.endContainer is not p.offsetNode or r.endOffset is not p.offset:
+                r.setEnd(p.offsetNode, p.offset)