diff --git a/src/test/regress/expected/create_procedure.out b/src/test/regress/expected/create_procedure.out
index 3281c926734..c2a334add93 100644
--- a/src/test/regress/expected/create_procedure.out
+++ b/src/test/regress/expected/create_procedure.out
@@ -227,6 +227,23 @@ CALL ptest6b(1.1, null, null);
  1.1 | {1.1}
 (1 row)
 
+CREATE PROCEDURE ptest6c(inout a anyelement, inout b anyelement)
+LANGUAGE SQL
+AS $$
+SELECT $1, 1;
+$$;
+CALL ptest6c(1, null);
+ a | b 
+---+---
+ 1 | 1
+(1 row)
+
+CALL ptest6c(1.1, null);  -- fails before v13
+  a  | b 
+-----+---
+ 1.1 | 1
+(1 row)
+
 -- collation assignment
 CREATE PROCEDURE ptest7(a text, b text)
 LANGUAGE SQL
diff --git a/src/test/regress/sql/create_procedure.sql b/src/test/regress/sql/create_procedure.sql
index c617577992a..9735d17a6d2 100644
--- a/src/test/regress/sql/create_procedure.sql
+++ b/src/test/regress/sql/create_procedure.sql
@@ -149,6 +149,15 @@ $$;
 CALL ptest6b(1, null, null);
 CALL ptest6b(1.1, null, null);
 
+CREATE PROCEDURE ptest6c(inout a anyelement, inout b anyelement)
+LANGUAGE SQL
+AS $$
+SELECT $1, 1;
+$$;
+
+CALL ptest6c(1, null);
+CALL ptest6c(1.1, null);  -- fails before v13
+
 
 -- collation assignment