diff --git a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
index a7efc823fbb..b2c75db0e54 100644
--- a/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
+++ b/src/Processors/Formats/Impl/AvroRowInputFormat.cpp
@@ -369,14 +369,25 @@ AvroDeserializer::DeserializeFn AvroDeserializer::createDeserializeFn(const avro
             break;
         case avro::AVRO_UNION:
         {
-            if (root_node->leaves() == 2
+            if (root_node->leaves() == 1)
+            {
+                auto nested_deserialize = createDeserializeFn(root_node->leafAt(0), target_type);
+                return [nested_deserialize](IColumn & column, avro::Decoder & decoder)
+                {
+                    decoder.decodeUnionIndex();
+                    nested_deserialize(column, decoder);
+                    return true;
+                };
+            }
+            /// FIXME Support UNION has more than two datatypes.
+            else if (
+                root_node->leaves() == 2
                 && (root_node->leafAt(0)->type() == avro::AVRO_NULL || root_node->leafAt(1)->type() == avro::AVRO_NULL))
             {
                 int non_null_union_index = root_node->leafAt(0)->type() == avro::AVRO_NULL ? 1 : 0;
                 if (target.isNullable())
                 {
-                    auto nested_deserialize = this->createDeserializeFn(
-                        root_node->leafAt(non_null_union_index), removeNullable(target_type));
+                    auto nested_deserialize = createDeserializeFn(root_node->leafAt(non_null_union_index), removeNullable(target_type));
                     return [non_null_union_index, nested_deserialize](IColumn & column, avro::Decoder & decoder)
                     {
                         ColumnNullable & col = assert_cast<ColumnNullable &>(column);
@@ -395,7 +406,7 @@ AvroDeserializer::DeserializeFn AvroDeserializer::createDeserializeFn(const avro
                 }
                 else if (null_as_default)
                 {
-                    auto nested_deserialize = this->createDeserializeFn(root_node->leafAt(non_null_union_index), target_type);
+                    auto nested_deserialize = createDeserializeFn(root_node->leafAt(non_null_union_index), target_type);
                     return [non_null_union_index, nested_deserialize](IColumn & column, avro::Decoder & decoder)
                     {
                         int union_index = static_cast<int>(decoder.decodeUnionIndex());
@@ -1192,12 +1203,19 @@ DataTypePtr AvroSchemaReader::avroNodeToDataType(avro::NodePtr node)
         case avro::Type::AVRO_NULL:
             return std::make_shared<DataTypeNothing>();
         case avro::Type::AVRO_UNION:
-            if (node->leaves() == 2 && (node->leafAt(0)->type() == avro::Type::AVRO_NULL || node->leafAt(1)->type() == avro::Type::AVRO_NULL))
+            if (node->leaves() == 1)
+            {
+                return avroNodeToDataType(node->leafAt(0));
+            }
+            else if (
+                node->leaves() == 2
+                && (node->leafAt(0)->type() == avro::Type::AVRO_NULL || node->leafAt(1)->type() == avro::Type::AVRO_NULL))
             {
                 int nested_leaf_index = node->leafAt(0)->type() == avro::Type::AVRO_NULL ? 1 : 0;
                 auto nested_type = avroNodeToDataType(node->leafAt(nested_leaf_index));
                 return nested_type->canBeInsideNullable() ? makeNullable(nested_type) : nested_type;
             }
+            /// FIXME Support UNION has more than two datatypes.
             throw Exception(ErrorCodes::ILLEGAL_COLUMN, "Avro type  UNION is not supported for inserting.");
         case avro::Type::AVRO_SYMBOLIC:
             return avroNodeToDataType(avro::resolveSymbol(node));
diff --git a/tests/queries/0_stateless/02813_avro_union_with_one_type.reference b/tests/queries/0_stateless/02813_avro_union_with_one_type.reference
new file mode 100644
index 00000000000..c65bed48055
--- /dev/null
+++ b/tests/queries/0_stateless/02813_avro_union_with_one_type.reference
@@ -0,0 +1,5 @@
+name	String					
+favorite_number	Int32					
+favorite_color	String					
+Alyssa	256	yellow
+Ben	7	red
diff --git a/tests/queries/0_stateless/02813_avro_union_with_one_type.sh b/tests/queries/0_stateless/02813_avro_union_with_one_type.sh
new file mode 100755
index 00000000000..b58dc9126da
--- /dev/null
+++ b/tests/queries/0_stateless/02813_avro_union_with_one_type.sh
@@ -0,0 +1,13 @@
+#!/usr/bin/env bash
+# Tags: no-parallel, no-fasttest
+
+set -e
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+DATA_DIR=$CUR_DIR/data_avro
+
+$CLICKHOUSE_LOCAL -q "desc file('$DATA_DIR/union_one_type.avro')"
+$CLICKHOUSE_LOCAL -q "select * from file('$DATA_DIR/union_one_type.avro')"
diff --git a/tests/queries/0_stateless/data_avro/union_one_type.avro b/tests/queries/0_stateless/data_avro/union_one_type.avro
new file mode 100644
index 00000000000..07e6140e5e2
Binary files /dev/null and b/tests/queries/0_stateless/data_avro/union_one_type.avro differ