diff --git a/tests/test_types_basic.py b/tests/test_types_basic.py
index d21309ef..781dc44e 100755
--- a/tests/test_types_basic.py
+++ b/tests/test_types_basic.py
@@ -236,27 +236,27 @@ class TypesBasicTests(ConnectingTestCase):
               boolaa boolean[][]
             )""")
 
-        curs.execute("insert into na (texta) values (%s)", ([None],))
-        curs.execute("insert into na (texta) values (%s)", (['a', None],))
-        curs.execute("insert into na (texta) values (%s)", ([None, None],))
-        curs.execute("insert into na (inta) values (%s)", ([None],))
-        curs.execute("insert into na (inta) values (%s)", ([42, None],))
-        curs.execute("insert into na (inta) values (%s)", ([None, None],))
-        curs.execute("insert into na (boola) values (%s)", ([None],))
-        curs.execute("insert into na (boola) values (%s)", ([True, None],))
-        curs.execute("insert into na (boola) values (%s)", ([None, None],))
+        curs.execute("insert into na (texta) values (%s::text[])", ([None],))
+        curs.execute("insert into na (texta) values (%s::text[])", (['a', None],))
+        curs.execute("insert into na (texta) values (%s::text[])", ([None, None],))
+        curs.execute("insert into na (inta) values (%s::int[])", ([None],))
+        curs.execute("insert into na (inta) values (%s::int[])", ([42, None],))
+        curs.execute("insert into na (inta) values (%s::int[])", ([None, None],))
+        curs.execute("insert into na (boola) values (%s::boolean[])", ([None],))
+        curs.execute("insert into na (boola) values (%s::boolean[])", ([True, None],))
+        curs.execute("insert into na (boola) values (%s::boolean[])", ([None, None],))
 
-        curs.execute("insert into na (textaa) values (%s)", ([[None]],))
-        curs.execute("insert into na (textaa) values (%s)", ([['a', None]],))
-        curs.execute("insert into na (textaa) values (%s)", ([[None, None]],))
+        curs.execute("insert into na (textaa) values (%s::text[][])", ([[None]],))
+        curs.execute("insert into na (textaa) values (%s::text[][])", ([['a', None]],))
+        curs.execute("insert into na (textaa) values (%s::text[][])", ([[None, None]],))
 
-        curs.execute("insert into na (intaa) values (%s)", ([[None]],))
-        curs.execute("insert into na (intaa) values (%s)", ([[42, None]],))
-        curs.execute("insert into na (intaa) values (%s)", ([[None, None]],))
+        curs.execute("insert into na (intaa) values (%s::int[][])", ([[None]],))
+        curs.execute("insert into na (intaa) values (%s::int[][])", ([[42, None]],))
+        curs.execute("insert into na (intaa) values (%s::int[][])", ([[None, None]],))
 
-        curs.execute("insert into na (boolaa) values (%s)", ([[None]],))
-        curs.execute("insert into na (boolaa) values (%s)", ([[True, None]],))
-        curs.execute("insert into na (boolaa) values (%s)", ([[None, None]],))
+        curs.execute("insert into na (boolaa) values (%s::boolean[][])", ([[None]],))
+        curs.execute("insert into na (boolaa) values (%s::boolean[][])", ([[True, None]],))
+        curs.execute("insert into na (boolaa) values (%s::boolean[][])", ([[None, None]],))
 
     @skip_if_crdb("nested array")
     @testutils.skip_before_postgres(8, 2)