diff --git a/test/expected/input.out b/test/expected/input.out
index 19ef74d..102ca51 100644
--- a/test/expected/input.out
+++ b/test/expected/input.out
@@ -81,6 +81,11 @@ ERROR:  malformed vector literal: "1,2,3"
 LINE 1: SELECT '1,2,3'::vector;
                ^
 DETAIL:  Vector contents must start with "[".
+SELECT ''::vector;
+ERROR:  malformed vector literal: ""
+LINE 1: SELECT ''::vector;
+               ^
+DETAIL:  Vector contents must start with "[".
 SELECT '['::vector;
 ERROR:  malformed vector literal: "["
 LINE 1: SELECT '['::vector;
diff --git a/test/sql/input.sql b/test/sql/input.sql
index a4ad08d..9f5809c 100644
--- a/test/sql/input.sql
+++ b/test/sql/input.sql
@@ -14,6 +14,7 @@ SELECT '[4e38,1]'::vector;
 SELECT '[1,2,3'::vector;
 SELECT '[1,2,3]9'::vector;
 SELECT '1,2,3'::vector;
+SELECT ''::vector;
 SELECT '['::vector;
 SELECT '[,'::vector;
 SELECT '[]'::vector;