diff --git a/ext/pdo/pdo_dbh.c b/ext/pdo/pdo_dbh.c
index 7843f94dea6..da009717600 100755
--- a/ext/pdo/pdo_dbh.c
+++ b/ext/pdo/pdo_dbh.c
@@ -252,7 +252,7 @@ static PHP_METHOD(PDO, dbh_constructor)
 
 	if (!strncmp(data_source, "uri:", sizeof("uri:")-1)) {
 		/* the specified URI holds connection details */
-		data_source = dsn_from_uri(data_source, alt_dsn, sizeof(alt_dsn) TSRMLS_CC);
+		data_source = dsn_from_uri(data_source + sizeof("uri:")-1, alt_dsn, sizeof(alt_dsn) TSRMLS_CC);
 		if (!data_source) {
 			zend_throw_exception_ex(php_pdo_get_exception(), 0 TSRMLS_CC, "invalid data source URI");
 			ZVAL_NULL(object);