diff --git a/src/test/regress/expected/multi_test_helpers.out b/src/test/regress/expected/multi_test_helpers.out
index 957a3d11b..5c36fdd7d 100644
--- a/src/test/regress/expected/multi_test_helpers.out
+++ b/src/test/regress/expected/multi_test_helpers.out
@@ -724,7 +724,7 @@ END; $$ language plpgsql;
 -- ignore details such as exact costs or row counts.  These filter
 -- functions replace changeable output details with fixed strings.
 -- Copied from PG explain.sql
-create function explain_filter(text) returns setof text
+create or replace function explain_filter(text) returns setof text
 language plpgsql as
 $$
 declare
diff --git a/src/test/regress/sql/multi_test_helpers.sql b/src/test/regress/sql/multi_test_helpers.sql
index 10242692c..8d364602a 100644
--- a/src/test/regress/sql/multi_test_helpers.sql
+++ b/src/test/regress/sql/multi_test_helpers.sql
@@ -755,7 +755,7 @@ END; $$ language plpgsql;
 -- functions replace changeable output details with fixed strings.
 -- Copied from PG explain.sql
 
-create function explain_filter(text) returns setof text
+create or replace function explain_filter(text) returns setof text
 language plpgsql as
 $$
 declare