diff --git a/ext/pdo_pgsql/pdo_pgsql.c b/ext/pdo_pgsql/pdo_pgsql.c
index 877b751a85044..49efa0b238484 100644
--- a/ext/pdo_pgsql/pdo_pgsql.c
+++ b/ext/pdo_pgsql/pdo_pgsql.c
@@ -184,9 +184,6 @@ PHP_MINIT_FUNCTION(pdo_pgsql)
 	REGISTER_PDO_CLASS_CONST_LONG("PGSQL_TRANSACTION_INTRANS", (zend_long)PGSQL_TRANSACTION_INTRANS);
 	REGISTER_PDO_CLASS_CONST_LONG("PGSQL_TRANSACTION_INERROR", (zend_long)PGSQL_TRANSACTION_INERROR);
 	REGISTER_PDO_CLASS_CONST_LONG("PGSQL_TRANSACTION_UNKNOWN", (zend_long)PGSQL_TRANSACTION_UNKNOWN);
-#ifdef HAVE_PG_RESULT_MEMORY_SIZE
-	REGISTER_PDO_CLASS_CONST_LONG("PGSQL_ATTR_RESULT_MEMORY_SIZE", (zend_long)PDO_PGSQL_ATTR_RESULT_MEMORY_SIZE);
-#endif
 
 	PdoPgsql_ce = register_class_Pdo_Pgsql(pdo_dbh_ce);
 	PdoPgsql_ce->create_object = pdo_dbh_new;
diff --git a/ext/pdo_pgsql/tests/result_memory_size.phpt b/ext/pdo_pgsql/tests/result_memory_size.phpt
index ce73e4af32664..7b382ea63e8bd 100644
--- a/ext/pdo_pgsql/tests/result_memory_size.phpt
+++ b/ext/pdo_pgsql/tests/result_memory_size.phpt
@@ -1,5 +1,5 @@
 --TEST--
-PDO PgSQL PDOStatement::getAttribute(PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE)
+PDO PgSQL PDOStatement::getAttribute(Pgsql::ATTR_RESULT_MEMORY_SIZE)
 --EXTENSIONS--
 pdo_pgsql
 --SKIPIF--
@@ -7,7 +7,7 @@ pdo_pgsql
 require __DIR__ . '/config.inc';
 require dirname(__DIR__, 2) . '/pdo/tests/pdo_test.inc';
 PDOTest::skip();
-if (!defined('PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE')) die('skip constant PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE does not exist');
+if (!defined('Pgsql::ATTR_RESULT_MEMORY_SIZE')) die('skip constant Pgsql::ATTR_RESULT_MEMORY_SIZE does not exist');
 --FILE--
 <?php
 
@@ -18,12 +18,12 @@ $db =  Pdo::connect($config['ENV']['PDOTEST_DSN']);
 
 echo 'Result set with only 1 row: ';
 $statement = $db->query('select 1');
-$result_1 = $statement->getAttribute(PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE);
+$result_1 = $statement->getAttribute(Pgsql::ATTR_RESULT_MEMORY_SIZE);
 var_dump($result_1);
 
 echo 'Result set with many rows: ';
 $result = $db->query('select generate_series(1, 10000)');
-$result_2 = $result->getAttribute(PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE);
+$result_2 = $result->getAttribute(Pgsql::ATTR_RESULT_MEMORY_SIZE);
 var_dump($result_2);
 
 echo 'Large result sets should require more memory than small ones: ';
@@ -31,7 +31,7 @@ var_dump($result_2 > $result_1);
 
 echo 'Statements that are not executed should not consume memory: ';
 $statement = $db->prepare('select 1');
-$result_3 = $statement->getAttribute(PDO::PGSQL_ATTR_RESULT_MEMORY_SIZE);
+$result_3 = $statement->getAttribute(Pgsql::ATTR_RESULT_MEMORY_SIZE);
 var_dump($result_3);
 
 echo 'and should emit Error: ';