diff --git a/src/mfast/coder/encoder_v2/fast_encoder_core.h b/src/mfast/coder/encoder_v2/fast_encoder_core.h
index b90d169d..6a706c3a 100644
--- a/src/mfast/coder/encoder_v2/fast_encoder_core.h
+++ b/src/mfast/coder/encoder_v2/fast_encoder_core.h
@@ -2,6 +2,7 @@
 
 #include "../mfast_coder_export.h"
 #include "../../sequence_ref.h"
+#include "../../enum_ref.h"
 #include "../../nested_message_ref.h"
 #include "../../malloc_allocator.h"
 #include "../common/template_repo.h"
@@ -31,6 +32,11 @@ inline bool equivalent(const decimal_cref &v, const value_storage &prev) {
          v.exponent() == prev.of_decimal.exponent_;
 }
 
+inline bool equivalent(const enum_cref &v, const value_storage &prev) {
+  return v.absent() == prev.is_empty() &&
+         v.value() == prev.of_uint64.content_;
+}
+
 template <typename T>
 inline bool equivalent(const vector_cref<T> &v, const value_storage &prev) {
   return v.size() == prev.of_array.len_ - 1 &&
diff --git a/src/mfast/enum_ref.h b/src/mfast/enum_ref.h
index e12f763c..33e7ab15 100644
--- a/src/mfast/enum_ref.h
+++ b/src/mfast/enum_ref.h
@@ -97,6 +97,11 @@ class enum_mref : public make_field_mref<enum_cref> {
     *this->storage() = this->instruction()->initial_value();
   }
   value_type value() const { return this->storage()->get<value_type>(); }
+
+protected:
+  friend class mfast::detail::codec_helper;
+
+  void copy_from(value_storage v) const { *this->storage() = v; }
 };
 
 template <> struct mref_of<enum_cref> { typedef enum_mref type; };
diff --git a/tests/enum_encoder_decoder.cpp b/tests/enum_encoder_decoder.cpp
index 9e89d59f..e8a0ca8f 100644
--- a/tests/enum_encoder_decoder.cpp
+++ b/tests/enum_encoder_decoder.cpp
@@ -17,3 +17,13 @@ TEST_CASE("enum test encoder/decoder","[enum_encoder_decoder]")
     REQUIRE(test_case.encoding(test_1.cref(),"\xC0\x81\x83",true));
     REQUIRE(test_case.decoding("\xC0\x81\x83",test_1.cref(),true));
 }
+
+TEST_CASE("enum test copy encoder/decoder","[enum_copy_encoder_decoder]")
+{
+    fast_test_coding_case<simple16::templates_description> test_case;
+    simple16::Test_3 test_3;
+    simple16::Test_3_mref test_3_mref = test_3.mref();
+    test_3_mref.set_discrete().as_Three();
+    REQUIRE(test_case.encoding(test_3.cref(),"\xE0\x83\x83",true));
+    REQUIRE(test_case.decoding("\xE0\x83\x83",test_3.cref(),true));
+}
diff --git a/tests/enum_encoder_decoder_v2.cpp b/tests/enum_encoder_decoder_v2.cpp
index 281a041a..0643b6c2 100644
--- a/tests/enum_encoder_decoder_v2.cpp
+++ b/tests/enum_encoder_decoder_v2.cpp
@@ -17,3 +17,13 @@ TEST_CASE("enum test encoder_V2/decoder_v2","[enum_encoder_v2_decoder_v2]")
     REQUIRE(test_case.encoding(test_1.cref(),"\xC0\x81\x83",true));
     REQUIRE(test_case.decoding("\xC0\x81\x83",test_1.cref(),true));
 }
+
+TEST_CASE("enum test copy encoder_V2/decoder_v2","[enum_copy_encoder_v2_decoder_v2]")
+{
+    fast_test_coding_case_v2<simple16::templates_description> test_case;
+    simple16::Test_3 test_3;
+    simple16::Test_3_mref test_3_mref = test_3.mref();
+    test_3_mref.set_discrete().as_Three();
+    REQUIRE(test_case.encoding(test_3.cref(),"\xE0\x83\x83",true));
+    REQUIRE(test_case.decoding("\xE0\x83\x83",test_3.cref(),true));
+}
diff --git a/tests/simple16.xml b/tests/simple16.xml
index e32fafc2..cb8207cd 100644
--- a/tests/simple16.xml
+++ b/tests/simple16.xml
@@ -18,4 +18,8 @@
   <template name="Test_2" id="2">
       <string name="MsgType" id="36"><constant value="DQ"/></string>
   </template>
+  <template name="Test_3" id="3">
+    <string name="MsgType" id="35"><constant value="HP"/></string>
+    <field name="discrete" id="2477"><type name="DiscreteEnum"><copy/></type></field>
+  </template>
 </templates>