diff --git a/contrib/hstore_plperl/hstore_plperl--1.0.sql b/contrib/hstore_plperl/hstore_plperl--1.0.sql
index ea0ad7688d..a4fd7c22db 100644
--- a/contrib/hstore_plperl/hstore_plperl--1.0.sql
+++ b/contrib/hstore_plperl/hstore_plperl--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '' LANGUAGE plperl;
+LOAD 'plperl';
 SELECT NULL::hstore;
 
 
diff --git a/contrib/hstore_plperl/hstore_plperlu--1.0.sql b/contrib/hstore_plperl/hstore_plperlu--1.0.sql
index 46ad35c487..2c2e3e3848 100644
--- a/contrib/hstore_plperl/hstore_plperlu--1.0.sql
+++ b/contrib/hstore_plperl/hstore_plperlu--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '' LANGUAGE plperlu;
+LOAD 'plperl';
 SELECT NULL::hstore;
 
 
diff --git a/contrib/hstore_plpython/hstore_plpython2u--1.0.sql b/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
index c998de51c9..a793dc9c0c 100644
--- a/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpython2u--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpython2u;
+LOAD 'plpython2';
 SELECT NULL::hstore;
 
 
diff --git a/contrib/hstore_plpython/hstore_plpython3u--1.0.sql b/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
index 61d0e47793..a85c85d4c1 100644
--- a/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpython3u--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpython3u;
+LOAD 'plpython3';
 SELECT NULL::hstore;
 
 
diff --git a/contrib/hstore_plpython/hstore_plpythonu--1.0.sql b/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
index 6acb97aab9..e2e4721dca 100644
--- a/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
+++ b/contrib/hstore_plpython/hstore_plpythonu--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpythonu;
+LOAD 'plpython2';  -- change to plpython3 if that ever becomes the default
 SELECT NULL::hstore;
 
 
diff --git a/contrib/ltree_plpython/ltree_plpython2u--1.0.sql b/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
index 29a12d45a2..f040bd3f56 100644
--- a/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpython2u--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpython2u;
+LOAD 'plpython2';
 SELECT NULL::ltree;
 
 
diff --git a/contrib/ltree_plpython/ltree_plpython3u--1.0.sql b/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
index 1300a78c66..7afe51f148 100644
--- a/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpython3u--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpython3u;
+LOAD 'plpython3';
 SELECT NULL::ltree;
 
 
diff --git a/contrib/ltree_plpython/ltree_plpythonu--1.0.sql b/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
index 1d1af28f4e..50f35dd16b 100644
--- a/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
+++ b/contrib/ltree_plpython/ltree_plpythonu--1.0.sql
@@ -1,5 +1,5 @@
 -- make sure the prerequisite libraries are loaded
-DO '1' LANGUAGE plpythonu;
+LOAD 'plpython2';  -- change to plpython3 if that ever becomes the default
 SELECT NULL::ltree;