diff --git a/src/include/fst/bi-table.h b/src/include/fst/bi-table.h
index 7c5be23..4527001 100644
--- a/src/include/fst/bi-table.h
+++ b/src/include/fst/bi-table.h
@@ -327,7 +327,7 @@ class VectorHashBiTable {
   }
 
   VectorHashBiTable(const VectorHashBiTable<I, T, S, FP, H, HS> &table)
-      : selector_(table.s_),
+      : selector_(table.selector_),
         fp_(table.fp_),
         h_(table.h_),
         id2entry_(table.id2entry_),
diff --git a/src/include/fst/fst.h b/src/include/fst/fst.h
index 80e3948..57cf1fd 100644
--- a/src/include/fst/fst.h
+++ b/src/include/fst/fst.h
@@ -701,8 +701,8 @@ class FstImpl {
     properties_.store(impl.properties_.load(std::memory_order_relaxed),
                       std::memory_order_relaxed);
     type_ = impl.type_;
-    isymbols_ = impl.isymbols_ ? impl.isymbols_->Copy() : nullptr;
-    osymbols_ = impl.osymbols_ ? impl.osymbols_->Copy() : nullptr;
+    isymbols_.reset(impl.isymbols_ ? impl.isymbols_->Copy() : nullptr);
+    osymbols_.reset(impl.osymbols_ ? impl.osymbols_->Copy() : nullptr);
     return *this;
   }