diff --git a/fuzz/fuzz_seeds/postgres_alter_extension.sql b/fuzz/fuzz_seeds/postgres_alter_extension.sql
index cd6c59b598..101135d03a 100644
--- a/fuzz/fuzz_seeds/postgres_alter_extension.sql
+++ b/fuzz/fuzz_seeds/postgres_alter_extension.sql
@@ -28,3 +28,4 @@ ALTER EXTENSION citext DROP SUBSCRIPTION sub;
 ALTER EXTENSION citext ADD TABLESPACE ts;
 ALTER EXTENSION citext ADD FUNCTION public.f(IN a int, text);
 ALTER EXTENSION citext DROP PROCEDURE public.p(int);
+ALTER EXTENSION citext ADD ROUTINE public.r(int);
diff --git a/src/ast/ddl.rs b/src/ast/ddl.rs
index a7de3fa22e..a6a8dc7f9e 100644
--- a/src/ast/ddl.rs
+++ b/src/ast/ddl.rs
@@ -4963,6 +4963,8 @@ pub enum AlterExtensionMember {
     Procedure(FunctionDesc),
     /// `PUBLICATION object_name`
     Publication(Ident),
+    /// `ROUTINE routine_name [ ( [ [ argmode ] [ argname ] argtype [, ...] ] ) ]`
+    Routine(FunctionDesc),
     /// `ROLE object_name`
     Role(Ident),
     /// `SCHEMA object_name`
@@ -5035,6 +5037,7 @@ impl fmt::Display for AlterExtensionMember {
             AlterExtensionMember::MaterializedView(name) => write!(f, "MATERIALIZED VIEW {name}"),
             AlterExtensionMember::Procedure(function) => write!(f, "PROCEDURE {function}"),
             AlterExtensionMember::Publication(name) => write!(f, "PUBLICATION {name}"),
+            AlterExtensionMember::Routine(function) => write!(f, "ROUTINE {function}"),
             AlterExtensionMember::Role(name) => write!(f, "ROLE {name}"),
             AlterExtensionMember::Schema(name) => write!(f, "SCHEMA {name}"),
             AlterExtensionMember::Sequence(name) => write!(f, "SEQUENCE {name}"),
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 65b1c909ab..014e4f0d32 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -12585,6 +12585,8 @@ impl<'a> Parser<'a> {
             Ok(AlterExtensionMember::Procedure(self.parse_function_desc()?))
         } else if self.parse_keyword(Keyword::PUBLICATION) {
             Ok(AlterExtensionMember::Publication(self.parse_identifier()?))
+        } else if self.parse_keyword(Keyword::ROUTINE) {
+            Ok(AlterExtensionMember::Routine(self.parse_function_desc()?))
         } else if self.parse_keyword(Keyword::ROLE) {
             Ok(AlterExtensionMember::Role(self.parse_identifier()?))
         } else if self.parse_keyword(Keyword::SCHEMA) {
diff --git a/tests/sqlparser_postgres.rs b/tests/sqlparser_postgres.rs
index 13764e2c9c..923b33daa3 100644
--- a/tests/sqlparser_postgres.rs
+++ b/tests/sqlparser_postgres.rs
@@ -13550,6 +13550,8 @@ fn alter_extension_member_round_trip_forms(action: &str) {
         format!("ALTER EXTENSION ext_name {action} PROCEDURE p()"),
         format!("ALTER EXTENSION ext_name {action} PROCEDURE p(INT)"),
         format!("ALTER EXTENSION ext_name {action} PUBLICATION pub"),
+        format!("ALTER EXTENSION ext_name {action} ROUTINE r"),
+        format!("ALTER EXTENSION ext_name {action} ROUTINE r()"),
         format!("ALTER EXTENSION ext_name {action} ROLE role_name"),
         format!("ALTER EXTENSION ext_name {action} SCHEMA schema_name"),
         format!("ALTER EXTENSION ext_name {action} SEQUENCE seq"),
@@ -13752,6 +13754,10 @@ fn parse_alter_extension_add_member() {
             "ALTER EXTENSION ext_name ADD PROCEDURE 1",
             "Expected: identifier, found: 1",
         ),
+        (
+            "ALTER EXTENSION ext_name ADD ROUTINE 1",
+            "Expected: identifier, found: 1",
+        ),
     ] {
         assert_eq!(
             pg_and_generic().parse_sql_statements(sql).unwrap_err(),