diff --git a/ext/pdo/pdo_dbh.c b/ext/pdo/pdo_dbh.c
index e6265f58075..25db6842f62 100644
--- a/ext/pdo/pdo_dbh.c
+++ b/ext/pdo/pdo_dbh.c
@@ -338,6 +338,9 @@ static PHP_METHOD(PDO, dbh_constructor)
 			if (pdbh->std.properties) {
 				zend_hash_destroy(dbh->std.properties);	
 				efree(dbh->std.properties);
+				if (dbh->std.properties_table) {
+					efree(dbh->std.properties_table);
+				}
 			} else {
 				pdbh->std.ce = dbh->std.ce;
 				pdbh->def_stmt_ce = dbh->def_stmt_ce;
@@ -1575,6 +1578,7 @@ static void pdo_dbh_free_storage(pdo_dbh_t *dbh TSRMLS_DC)
 	}
 	zend_object_std_dtor(&dbh->std TSRMLS_CC);
 	dbh->std.properties = NULL;
+	dbh->std.properties_table = NULL;
 	dbh_free(dbh TSRMLS_CC);
 }
 
diff --git a/ext/pdo_mysql/tests/bug63176.phpt b/ext/pdo_mysql/tests/bug63176.phpt
new file mode 100644
index 00000000000..392a90b4637
--- /dev/null
+++ b/ext/pdo_mysql/tests/bug63176.phpt
@@ -0,0 +1,54 @@
+--TEST--
+Bug #63176 (Segmentation fault when instantiate 2 persistent PDO to the same db server)
+--SKIPIF--
+<?php
+require_once(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'skipif.inc');
+require_once(dirname(__FILE__) . DIRECTORY_SEPARATOR . 'mysql_pdo_test.inc');
+MySQLPDOTest::skip();
+?>
+--FILE--
+<?php
+require(dirname(__FILE__). DIRECTORY_SEPARATOR . 'config.inc');
+class PDO2 extends PDO {
+	protected $transLevel;
+}
+
+class PDO3 extends PDO {
+	protected $tomato;
+}
+
+
+class ModelA {
+	public function __construct($h) {
+		var_dump($h);
+		if ($h) {
+			$this->db = new PDO2(PDO_MYSQL_TEST_DSN, PDO_MYSQL_TEST_USER, PDO_MYSQL_TEST_PASS, array(PDO::ATTR_PERSISTENT => true));
+		} else {
+			$this->db = new PDO2(PDO_MYSQL_TEST_DSN, PDO_MYSQL_TEST_USER, PDO_MYSQL_TEST_PASS, array(PDO::ATTR_PERSISTENT => true));
+		}
+		$this->db->query('SELECT 1')->fetchAll();
+	}
+}
+
+$a = new ModelA(true);
+$b = new ModelA(false);
+
+var_dump($a);
+var_dump($b);
+--EXPECTF--
+bool(true)
+bool(false)
+object(ModelA)#%d (1) {
+  ["db"]=>
+  object(PDO2)#%d (1) {
+    ["transLevel":protected]=>
+    NULL
+  }
+}
+object(ModelA)#%d (1) {
+  ["db"]=>
+  object(PDO2)#%d (1) {
+    ["transLevel":protected]=>
+    NULL
+  }
+}