diff --git a/sudachipy/lattice.pyx b/sudachipy/lattice.pyx
index 86f68d7..fdb120e 100644
--- a/sudachipy/lattice.pyx
+++ b/sudachipy/lattice.pyx
@@ -57,15 +57,15 @@ cdef class Lattice:
         return self.end_lists[end]
 
     def get_nodes(self, begin: int, end: int) -> List[LatticeNode]:
-        return [node for node in self.end_lists[end] if node.begin == begin]
+        return [node for node in self.end_lists[end] if node.get_begin() == begin]
 
-    def get_minumum_node(self, begin: int, end: int) -> Optional[LatticeNode]:
+    def get_minimum_node(self, begin: int, end: int) -> Optional[LatticeNode]:
         nodes = self.get_nodes(begin, end)
         if not nodes:
             return None
         min_arg = nodes[0]
         for node in nodes[1:]:
-            if node.cost < min_arg.cost:
+            if node.get_path_cost() < min_arg.get_path_cost():
                 min_arg = node
         return min_arg
 
diff --git a/sudachipy/plugin/path_rewrite/path_rewrite_plugin.py b/sudachipy/plugin/path_rewrite/path_rewrite_plugin.py
index 3265c4e..7ccd744 100644
--- a/sudachipy/plugin/path_rewrite/path_rewrite_plugin.py
+++ b/sudachipy/plugin/path_rewrite/path_rewrite_plugin.py
@@ -62,6 +62,12 @@ def concatenate_oov(self, path, begin, end, pos_id, lattice):
             raise IndexError("begin >= end")
         b = path[begin].get_begin()
         e = path[end - 1].get_end()
+
+        n = lattice.get_minimum_node(b, e)
+        if n is not None:
+            path[begin:end] = [n]
+            return n
+
         surface = ""
         length = 0
         for i in range(begin, end):
@@ -76,6 +82,7 @@ def concatenate_oov(self, path, begin, end, pos_id, lattice):
         node = lattice.create_node()
         node.set_range(b, e)
         node.set_word_info(wi)
+        node.set_oov()
 
         path[begin:end] = [node]
         return node
diff --git a/tests/plugin/test_join_katakana_oov_plugin.py b/tests/plugin/test_join_katakana_oov_plugin.py
index d1fc70b..d025b4a 100644
--- a/tests/plugin/test_join_katakana_oov_plugin.py
+++ b/tests/plugin/test_join_katakana_oov_plugin.py
@@ -53,6 +53,8 @@ def test_pos(self):
         path = self.get_path('アイアイウ')
         self.assertEqual(1, len(path))
         self.assertFalse(path[0].is_oov())
+        self.assertEqual(['名詞', '固有名詞', '地名', '一般', '*', '*'],
+            self.dict_.grammar.get_part_of_speech_string(path[0].get_word_info().pos_id))
 
     def test_starts_with_middle(self):
         self.plugin._min_length = 3