diff --git a/src/pg/sql/42_observatory_exploration.sql b/src/pg/sql/42_observatory_exploration.sql
index ea56102..d88aa64 100644
--- a/src/pg/sql/42_observatory_exploration.sql
+++ b/src/pg/sql/42_observatory_exploration.sql
@@ -440,7 +440,7 @@ BEGIN
     FROM (
       WITH clipped_geom AS (
         SELECT column_id, table_id
-          , CASE WHEN $1 IS NOT NULL THEN st_clip(tile, $1, True)
+          , CASE WHEN $1 IS NOT NULL THEN ST_Clip(tile, $1, True)
                  ELSE tile END clipped_tile
           , tile
         FROM observatory.obs_column_table_tile