diff --git a/Makefile.in b/Makefile.in
index e3a32a3a..eb166667 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -11,7 +11,7 @@ toast_extended_storage \
 move_large_tuples \
 non_sorted_off_compact \
 update_compare_indexes \
-pgtde_is_encrypted \
+pg_tde_is_encrypted \
 test_issue_153_fix \
 multi_insert \
 trigger_on_view \
diff --git a/README.md b/README.md
index c64d27da..bbb5063e 100644
--- a/README.md
+++ b/README.md
@@ -164,7 +164,7 @@ docker build . -f ./docker/Dockerfile -t your-image-name
 
 The extension provides the following helper functions:
 
-### pgtde_is_encrypted(tablename)
+### pg_tde_is_encrypted(tablename)
 
 Returns `t` if the table is encrypted (uses the pg_tde access method), or `f` otherwise.
 
diff --git a/expected/change_access_method.out b/expected/change_access_method.out
index d08f1bf7..f8ea497e 100644
--- a/expected/change_access_method.out
+++ b/expected/change_access_method.out
@@ -29,9 +29,9 @@ SELECT * FROM country_table;
           3 | USA          | North America
 (3 rows)
 
-SELECT pgtde_is_encrypted('country_table');
- pgtde_is_encrypted 
---------------------
+SELECT pg_tde_is_encrypted('country_table');
+ pg_tde_is_encrypted 
+---------------------
  t
 (1 row)
 
@@ -53,9 +53,9 @@ SELECT * FROM country_table;
           6 | Canada       | North America
 (6 rows)
 
-SELECT pgtde_is_encrypted('country_table');
- pgtde_is_encrypted 
---------------------
+SELECT pg_tde_is_encrypted('country_table');
+ pg_tde_is_encrypted 
+---------------------
  f
 (1 row)
 
@@ -79,9 +79,9 @@ SELECT * FROM country_table;
           9 | Australia    | Oceania
 (9 rows)
 
-SELECT pgtde_is_encrypted('country_table');
- pgtde_is_encrypted 
---------------------
+SELECT pg_tde_is_encrypted('country_table');
+ pg_tde_is_encrypted 
+---------------------
  t
 (1 row)
 
diff --git a/expected/pgtde_is_encrypted.out b/expected/pg_tde_is_encrypted.out
similarity index 89%
rename from expected/pgtde_is_encrypted.out
rename to expected/pg_tde_is_encrypted.out
index 37726b99..e7f5774d 100644
--- a/expected/pgtde_is_encrypted.out
+++ b/expected/pg_tde_is_encrypted.out
@@ -36,15 +36,15 @@ SELECT amname FROM pg_class INNER JOIN pg_am ON pg_am.oid = pg_class.relam WHERE
  heap
 (1 row)
 
-SELECT pgtde_is_encrypted('test_enc');
- pgtde_is_encrypted 
---------------------
+SELECT pg_tde_is_encrypted('test_enc');
+ pg_tde_is_encrypted 
+---------------------
  t
 (1 row)
 
-SELECT pgtde_is_encrypted('test_norm');
- pgtde_is_encrypted 
---------------------
+SELECT pg_tde_is_encrypted('test_norm');
+ pg_tde_is_encrypted 
+---------------------
  f
 (1 row)
 
diff --git a/meson.build b/meson.build
index 98b43425..82410bb0 100644
--- a/meson.build
+++ b/meson.build
@@ -89,7 +89,7 @@ tests += {
       'move_large_tuples',
       'non_sorted_off_compact',
       'update_compare_indexes',
-      'pgtde_is_encrypted',
+      'pg_tde_is_encrypted',
       'test_issue_153_fix',
       'multi_insert',
       'keyprovider_dependency',
diff --git a/pg_tde--1.0.sql b/pg_tde--1.0.sql
index ae4ca39a..9490e5bf 100644
--- a/pg_tde--1.0.sql
+++ b/pg_tde--1.0.sql
@@ -62,7 +62,7 @@ RETURNS table_am_handler
 AS 'MODULE_PATHNAME'
 LANGUAGE C;
 
-CREATE FUNCTION pgtde_is_encrypted(table_name VARCHAR)
+CREATE FUNCTION pg_tde_is_encrypted(table_name VARCHAR)
 RETURNS boolean
 AS $$
 SELECT EXISTS (
diff --git a/sql/change_access_method.sql b/sql/change_access_method.sql
index bdcf0d11..f489befd 100644
--- a/sql/change_access_method.sql
+++ b/sql/change_access_method.sql
@@ -16,7 +16,7 @@ SELECT pg_tde_set_principal_key('test-db-principal-key','file-vault');
 
 SELECT * FROM country_table;
 
-SELECT pgtde_is_encrypted('country_table');
+SELECT pg_tde_is_encrypted('country_table');
 
 -- Try changing the encrypted table to an unencrypted table
 ALTER TABLE country_table SET access method  heap;
@@ -27,7 +27,7 @@ INSERT INTO country_table (country_name, continent)
             ('Canada', 'North America');
 
 SELECT * FROM country_table;
-SELECT pgtde_is_encrypted('country_table');
+SELECT pg_tde_is_encrypted('country_table');
 
 -- Change it back to encrypted
 ALTER TABLE country_table SET access method  pg_tde_basic;
@@ -37,7 +37,7 @@ INSERT INTO country_table (country_name, continent)
             ('Brazil', 'South America'),
             ('Australia', 'Oceania');
 SELECT * FROM country_table;
-SELECT pgtde_is_encrypted('country_table');
+SELECT pg_tde_is_encrypted('country_table');
 
 DROP TABLE country_table;
 DROP EXTENSION pg_tde;
diff --git a/sql/pgtde_is_encrypted.sql b/sql/pg_tde_is_encrypted.sql
similarity index 91%
rename from sql/pgtde_is_encrypted.sql
rename to sql/pg_tde_is_encrypted.sql
index d4a30385..d31872ed 100644
--- a/sql/pgtde_is_encrypted.sql
+++ b/sql/pg_tde_is_encrypted.sql
@@ -20,8 +20,8 @@ CREATE TABLE test_norm(
 SELECT amname FROM pg_class INNER JOIN pg_am ON pg_am.oid = pg_class.relam WHERE relname = 'test_enc';
 SELECT amname FROM pg_class INNER JOIN pg_am ON pg_am.oid = pg_class.relam WHERE relname = 'test_norm';
 
-SELECT pgtde_is_encrypted('test_enc');
-SELECT pgtde_is_encrypted('test_norm');
+SELECT pg_tde_is_encrypted('test_enc');
+SELECT pg_tde_is_encrypted('test_norm');
 
 SELECT  key_provider_id, key_provider_name, principal_key_name
 		FROM pg_tde_principal_key_info();