diff --git a/hll/include/HllUnion-internal.hpp b/hll/include/HllUnion-internal.hpp
index 1e99906..e738fc1 100644
--- a/hll/include/HllUnion-internal.hpp
+++ b/hll/include/HllUnion-internal.hpp
@@ -150,16 +150,6 @@
 }
 
 template<typename A>
-int hll_union_alloc<A>::get_compact_serialization_bytes() const {
-  return gadget.get_compact_serialization_bytes();
-}
-
-template<typename A>
-int hll_union_alloc<A>::get_updatable_serialization_bytes() const {
-  return gadget.get_updatable_serialization_bytes();
-}
-
-template<typename A>
 int hll_union_alloc<A>::get_lg_config_k() const {
   return gadget.get_lg_config_k();
 }
@@ -195,21 +185,11 @@
 }
 
 template<typename A>
-int hll_union_alloc<A>::get_serialization_version() const {
-  return HllUtil<A>::SER_VER;
-}
-
-template<typename A>
 target_hll_type hll_union_alloc<A>::get_target_type() const {
   return target_hll_type::HLL_8;
 }
 
 template<typename A>
-int hll_union_alloc<A>::get_max_serialization_bytes(const int lg_k) {
-  return hll_sketch_alloc<A>::get_max_updatable_serialization_bytes(lg_k, target_hll_type::HLL_8);
-}
-
-template<typename A>
 double hll_union_alloc<A>::get_rel_err(const bool upper_bound, const bool unioned,
                            const int lg_config_k, const int num_std_dev) {
   return HllUtil<A>::getRelErr(upper_bound, unioned, lg_config_k, num_std_dev);
diff --git a/hll/include/hll.hpp b/hll/include/hll.hpp
index 07f9257..e57f886 100644
--- a/hll/include/hll.hpp
+++ b/hll/include/hll.hpp
@@ -469,18 +469,6 @@
     double get_upper_bound(int num_std_dev) const;
 
     /**
-     * Returns the size of the union serialized in compact form.
-     * @return Size of the union serialized in compact form, in bytes.
-     */
-    int get_compact_serialization_bytes() const;
-
-    /**
-     * Returns the size of the union serialized without compaction.
-     * @return Size of the union serialized without compaction, in bytes.
-     */
-    int get_updatable_serialization_bytes() const;
-
-    /**
      * Returns union's configured lg_k value.
      * @return Configured lg_k value.
      */
@@ -606,15 +594,6 @@
     void update(const void* data, size_t length_bytes);
 
     /**
-     * Returns the maximum size in bytes that this union operator can grow to given a lg_k.
-     *
-     * @param lg_k The maximum Log2 of k for this union operator. This value must be
-     * between 4 and 21 inclusively.
-     * @return the maximum size in bytes that this union operator can grow to.
-     */
-    static int get_max_serialization_bytes(int lg_k);
-
-    /**
      * Gets the current (approximate) Relative Error (RE) asymptotic values given several
      * parameters. This is used primarily for testing.
      * @param upper_bound return the RE for the Upper Bound, otherwise for the Lower Bound.
@@ -645,7 +624,6 @@
     void coupon_update(int coupon);
 
     hll_mode get_current_mode() const;
-    int get_serialization_version() const;
     bool is_out_of_order_flag() const;
     bool is_estimation_mode() const;