diff --git a/src/Storages/AlterCommands.cpp b/src/Storages/AlterCommands.cpp
index 44f208adacc..16e1f044fd9 100644
--- a/src/Storages/AlterCommands.cpp
+++ b/src/Storages/AlterCommands.cpp
@@ -696,20 +696,22 @@ namespace
 /// The function works for Arrays and Nullables of the same structure.
 bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
 {
-    if (from->equals(*to))
-        return true;
-
-    if (const auto * from_enum8 = typeid_cast<const DataTypeEnum8 *>(from))
+    auto is_compatible_enum_types_conversion = [](const IDataType * from_type, const IDataType * to_type)
     {
-        if (const auto * to_enum8 = typeid_cast<const DataTypeEnum8 *>(to))
-            return to_enum8->contains(*from_enum8);
-    }
+        if (const auto * from_enum8 = typeid_cast<const DataTypeEnum8 *>(from_type))
+        {
+            if (const auto * to_enum8 = typeid_cast<const DataTypeEnum8 *>(to_type))
+                return to_enum8->contains(*from_enum8);
+        }
 
-    if (const auto * from_enum16 = typeid_cast<const DataTypeEnum16 *>(from))
-    {
-        if (const auto * to_enum16 = typeid_cast<const DataTypeEnum16 *>(to))
-            return to_enum16->contains(*from_enum16);
-    }
+        if (const auto * from_enum16 = typeid_cast<const DataTypeEnum16 *>(from_type))
+        {
+            if (const auto * to_enum16 = typeid_cast<const DataTypeEnum16 *>(to_type))
+                return to_enum16->contains(*from_enum16);
+        }
+
+        return false;
+    };
 
     static const std::unordered_multimap<std::type_index, const std::type_info &> ALLOWED_CONVERSIONS =
         {
@@ -721,11 +723,18 @@ bool isMetadataOnlyConversion(const IDataType * from, const IDataType * to)
             { typeid(DataTypeUInt16),   typeid(DataTypeDate)     },
         };
 
+    /// Unwrap some nested and check for valid conevrsions
     while (true)
     {
+        /// types are equal, obviously pure metadata alter
         if (from->equals(*to))
             return true;
 
+        /// We just adding something to enum, nothing changed on disk
+        if (is_compatible_enum_types_conversion(from, to))
+            return true;
+
+        /// Types changed, but representation on disk didn't
         auto it_range = ALLOWED_CONVERSIONS.equal_range(typeid(*from));
         for (auto it = it_range.first; it != it_range.second; ++it)
         {
diff --git a/tests/queries/0_stateless/02251_alter_enum_nested_struct.reference b/tests/queries/0_stateless/02251_alter_enum_nested_struct.reference
new file mode 100644
index 00000000000..ada5f47c230
--- /dev/null
+++ b/tests/queries/0_stateless/02251_alter_enum_nested_struct.reference
@@ -0,0 +1,7 @@
+1	['Option2','Option1']
+2	['Option1']
+3	['Option1','Option3']
+1	['Option2','Option1']
+2	['Option1']
+3	['Option1','Option3']
+0
diff --git a/tests/queries/0_stateless/02251_alter_enum_nested_struct.sql b/tests/queries/0_stateless/02251_alter_enum_nested_struct.sql
new file mode 100644
index 00000000000..ad2dab3631f
--- /dev/null
+++ b/tests/queries/0_stateless/02251_alter_enum_nested_struct.sql
@@ -0,0 +1,27 @@
+DROP TABLE IF EXISTS alter_enum_array;
+
+CREATE TABLE alter_enum_array(
+    Key UInt64,
+    Value Array(Enum8('Option1'=1, 'Option2'=2))
+)
+ENGINE=MergeTree()
+ORDER BY tuple();
+
+INSERT INTO alter_enum_array VALUES (1, ['Option2', 'Option1']), (2, ['Option1']);
+
+ALTER TABLE alter_enum_array MODIFY COLUMN Value  Array(Enum8('Option1'=1, 'Option2'=2, 'Option3'=3)) SETTINGS mutations_sync=2;
+
+INSERT INTO alter_enum_array VALUES (3, ['Option1','Option3']);
+
+SELECT * FROM alter_enum_array ORDER BY Key;
+
+DETACH TABLE alter_enum_array;
+ATTACH TABLE alter_enum_array;
+
+SELECT * FROM alter_enum_array ORDER BY Key;
+
+OPTIMIZE TABLE alter_enum_array FINAL;
+
+SELECT COUNT() FROM system.mutations where table='alter_enum_array' and database=currentDatabase();
+
+DROP TABLE IF EXISTS alter_enum_array;