diff --git a/lib/src/sql/function.rs b/lib/src/sql/function.rs
index 37545fc8..177d0d29 100644
--- a/lib/src/sql/function.rs
+++ b/lib/src/sql/function.rs
@@ -18,7 +18,9 @@ use nom::branch::alt;
 use nom::bytes::complete::tag;
 use nom::bytes::complete::take_while1;
 use nom::character::complete::char;
+use nom::combinator::recognize;
 use nom::multi::separated_list0;
+use nom::multi::separated_list1;
 use serde::ser::SerializeTupleVariant;
 use serde::{Deserialize, Serialize};
 use std::cmp::Ordering;
@@ -277,7 +279,8 @@ pub fn normal(i: &str) -> IResult<&str, Function> {
 
 pub fn custom(i: &str) -> IResult<&str, Function> {
 	let (i, _) = tag("fn::")(i)?;
-	let (i, s) = take_while1(val_char)(i)?;
+	let (i, s) = recognize(separated_list1(tag("::"), take_while1(val_char)))(i)?;
+	let (i, _) = mightbespace(i)?;
 	let (i, _) = char('(')(i)?;
 	let (i, _) = mightbespace(i)?;
 	let (i, a) = separated_list0(commas, value)(i)?;
diff --git a/lib/src/sql/ident.rs b/lib/src/sql/ident.rs
index c06522ff..4f4c9c9c 100644
--- a/lib/src/sql/ident.rs
+++ b/lib/src/sql/ident.rs
@@ -4,9 +4,12 @@ use crate::sql::escape::escape_ident;
 use nom::branch::alt;
 use nom::bytes::complete::escaped_transform;
 use nom::bytes::complete::is_not;
+use nom::bytes::complete::tag;
 use nom::bytes::complete::take_while1;
 use nom::character::complete::char;
+use nom::combinator::recognize;
 use nom::combinator::value;
+use nom::multi::separated_list1;
 use nom::sequence::delimited;
 use serde::{Deserialize, Serialize};
 use std::fmt::{self, Display, Formatter};
@@ -65,7 +68,12 @@ pub fn ident(i: &str) -> IResult<&str, Ident> {
 }
 
 pub fn plain(i: &str) -> IResult<&str, Ident> {
-	let (i, v) = ident_default(i)?;
+	let (i, v) = take_while1(val_char)(i)?;
+	Ok((i, Ident::from(v)))
+}
+
+pub fn multi(i: &str) -> IResult<&str, Ident> {
+	let (i, v) = recognize(separated_list1(tag("::"), take_while1(val_char)))(i)?;
 	Ok((i, Ident::from(v)))
 }
 
diff --git a/lib/src/sql/statements/define.rs b/lib/src/sql/statements/define.rs
index 9ba02c1b..2a978259 100644
--- a/lib/src/sql/statements/define.rs
+++ b/lib/src/sql/statements/define.rs
@@ -277,7 +277,7 @@ fn function(i: &str) -> IResult<&str, DefineFunctionStatement> {
 	let (i, _) = tag_no_case("FUNCTION")(i)?;
 	let (i, _) = shouldbespace(i)?;
 	let (i, _) = tag("fn::")(i)?;
-	let (i, name) = ident::plain(i)?;
+	let (i, name) = ident::multi(i)?;
 	let (i, _) = mightbespace(i)?;
 	let (i, _) = char('(')(i)?;
 	let (i, _) = mightbespace(i)?;