diff --git a/mysql-test/r/alter_table.result b/mysql-test/r/alter_table.result
index e01f4fa047b..f0edfc9bb59 100644
--- a/mysql-test/r/alter_table.result
+++ b/mysql-test/r/alter_table.result
@@ -1240,4 +1240,16 @@ select (@orig_max_data_length > @changed_max_data_length);
 (@orig_max_data_length > @changed_max_data_length)
 1
 drop table t1;
+CREATE TABLE t1(a INT AUTO_INCREMENT PRIMARY KEY, 
+b ENUM('a', 'b', 'c') NOT NULL);
+INSERT INTO t1 (b) VALUES ('a'), ('c'), ('b'), ('b'), ('a');
+ALTER TABLE t1 MODIFY b ENUM('a', 'z', 'b', 'c') NOT NULL;
+SELECT * FROM t1;
+a	b
+1	a
+2	c
+3	b
+4	b
+5	a
+DROP TABLE t1;
 End of 5.1 tests
diff --git a/mysql-test/r/binlog_format_basic.result b/mysql-test/r/binlog_format_basic.result
index 3fee9bade7e..72ba35cd753 100644
--- a/mysql-test/r/binlog_format_basic.result
+++ b/mysql-test/r/binlog_format_basic.result
@@ -1,3 +1,6 @@
+SELECT @@GLOBAL.binlog_format;
+@@GLOBAL.binlog_format
+STATEMENT
 '#---------------------BS_STVARS_002_01----------------------#'
 SELECT COUNT(@@GLOBAL.binlog_format);
 COUNT(@@GLOBAL.binlog_format)
diff --git a/mysql-test/t/alter_table.test b/mysql-test/t/alter_table.test
index 8502ba3f3d3..76d57e76491 100644
--- a/mysql-test/t/alter_table.test
+++ b/mysql-test/t/alter_table.test
@@ -977,4 +977,14 @@ select (@orig_max_data_length > @changed_max_data_length);
 
 drop table t1;
 
+#
+# Bug #23113: Different behavior on altering ENUM fields between 5.0 and 5.1
+#
+CREATE TABLE t1(a INT AUTO_INCREMENT PRIMARY KEY, 
+  b ENUM('a', 'b', 'c') NOT NULL);
+INSERT INTO t1 (b) VALUES ('a'), ('c'), ('b'), ('b'), ('a');
+ALTER TABLE t1 MODIFY b ENUM('a', 'z', 'b', 'c') NOT NULL;
+SELECT * FROM t1;
+DROP TABLE t1;
+
 --echo End of 5.1 tests
diff --git a/mysql-test/t/binlog_format_basic.test b/mysql-test/t/binlog_format_basic.test
index e9dfade8f56..819ad047c1b 100644
--- a/mysql-test/t/binlog_format_basic.test
+++ b/mysql-test/t/binlog_format_basic.test
@@ -22,6 +22,13 @@
 #                                                                             #
 ###############################################################################
 
+###################################################################
+# BUG#39812: Make statement replication default for 5.1 (to match 5.0)
+# We just verify that the default binlog_format is STATEMENT in 5.1.
+# In 6.0, it should be MIXED.
+###################################################################
+SELECT @@GLOBAL.binlog_format;
+
 --echo '#---------------------BS_STVARS_002_01----------------------#'
 ####################################################################
 #   Displaying default value                                       #
diff --git a/sql/field.cc b/sql/field.cc
index 16bf0fdb070..a03beb4e8af 100644
--- a/sql/field.cc
+++ b/sql/field.cc
@@ -8783,28 +8783,43 @@ bool Field::eq_def(Field *field)
   return 1;
 }
 
+
 /**
   @return
   returns 1 if the fields are equally defined
 */
+
 bool Field_enum::eq_def(Field *field)
 {
   if (!Field::eq_def(field))
     return 0;
-  TYPELIB *from_lib=((Field_enum*) field)->typelib;
-
-  if (typelib->count < from_lib->count)
-    return 0;
-  for (uint i=0 ; i < from_lib->count ; i++)
-    if (my_strnncoll(field_charset,
-                     (const uchar*)typelib->type_names[i],
-                     strlen(typelib->type_names[i]),
-                     (const uchar*)from_lib->type_names[i],
-                     strlen(from_lib->type_names[i])))
-      return 0;
-  return 1;
+  return compare_enum_values(((Field_enum*) field)->typelib);
 }
 
+
+bool Field_enum::compare_enum_values(TYPELIB *values)
+{
+  if (typelib->count != values->count)
+    return FALSE;
+  for (uint i= 0; i < typelib->count; i++)
+    if (my_strnncoll(field_charset,
+                     (const uchar*) typelib->type_names[i],
+                     typelib->type_lengths[i],
+                     (const uchar*) values->type_names[i],
+                     values->type_lengths[i]))
+      return FALSE;
+  return TRUE;
+}
+
+
+uint Field_enum::is_equal(Create_field *new_field)
+{
+  if (!Field_str::is_equal(new_field))
+    return 0;
+  return compare_enum_values(new_field->interval);
+}
+
+
 /**
   @return
   returns 1 if the fields are equally defined
diff --git a/sql/field.h b/sql/field.h
index aa69fea6bdd..81905cc64ae 100644
--- a/sql/field.h
+++ b/sql/field.h
@@ -1853,6 +1853,8 @@ public:
   CHARSET_INFO *sort_charset(void) const { return &my_charset_bin; }
 private:
   int do_save_field_metadata(uchar *first_byte);
+  bool compare_enum_values(TYPELIB *values);
+  uint is_equal(Create_field *new_field);
 };