diff --git a/raster/rt_pg/rtpostgis.sql.in b/raster/rt_pg/rtpostgis.sql.in
index 4007ce356ee..480345cfd2b 100644
--- a/raster/rt_pg/rtpostgis.sql.in
+++ b/raster/rt_pg/rtpostgis.sql.in
@@ -4,6 +4,7 @@
 -- PostGIS Raster - Raster Type for PostGIS
 -- http://trac.osgeo.org/postgis/wiki/WKTRaster
 --
+-- Copyright (c) 2015-2017 Regina Obe <lr@pcorp.us>
 -- Copyright (c) 2009-2012 Sandro Santilli <strk@kbt.io>
 -- Copyright (c) 2009-2010 Pierre Racine <pierre.racine@sbf.ulaval.ca>
 -- Copyright (c) 2009-2010 Jorge Arevalo <jorge.arevalo@deimos-space.com>
@@ -7037,7 +7038,7 @@ CREATE OR REPLACE FUNCTION _raster_constraint_info_blocksize(rastschema name, ra
 	SELECT
 		CASE
 			WHEN strpos(s.consrc, 'ANY (ARRAY[') > 0 THEN
-				split_part((regexp_matches(s.consrc, E'ARRAY\\[(.*?){1}\\]'))[1], ',', 1)::integer
+				split_part((substring(s.consrc FROM E'ARRAY\\[(.*?){1}\\]')), ',', 1)::integer
 			ELSE
 				regexp_replace(
 					split_part(s.consrc, '= ', 2),