diff --git a/src/pygambit/gametree.pxi b/src/pygambit/gametree.pxi
index cf1efd0ed8..f7b4ac3aff 100644
--- a/src/pygambit/gametree.pxi
+++ b/src/pygambit/gametree.pxi
@@ -227,7 +227,7 @@ class ExtensiveGame(Game):
                 raise TypeError(f"_get_nodes(): unknown selector op {op!r}")
         if current is None:
             current = [self._root()]
-        return current
+        return list(dict.fromkeys(current))
 
     def _get_histories(self, selector: Selector) -> list[History]:
         """Evaluate `selector` (an `H`-built expression) against this game,
diff --git a/tests/test_hsel.py b/tests/test_hsel.py
index e4a491c691..d1b1220b5b 100644
--- a/tests/test_hsel.py
+++ b/tests/test_hsel.py
@@ -199,3 +199,12 @@ def test_by_last_action_distinguishes_infosets_sharing_a_label():
         frozenset({("R", "U")}),
         frozenset({("R", "D")}),
     }
+
+
+def test_selector_deduplicates_plays():
+    game = gbt.ExtensiveGame(players=["A", "B"])
+    game.append_move(gbt.H.path(), "A", ["go", "stop"])
+    game.append_move(gbt.H.path("go"), "B", ["go", "stay"])
+    plays = game.get_histories(gbt.H.after("go").plays)
+    assert {h.actions for h in plays} == {("go", "go"), ("go", "stay")}
+    assert len(plays) == 2, f"expected 2 unique plays, got {len(plays)}: {plays}"