diff --git a/src/parse.rs b/src/parse.rs
index da378114..a776deee 100644
--- a/src/parse.rs
+++ b/src/parse.rs
@@ -11,7 +11,8 @@ use crate::fn_hash::get_hasher;
 use crate::module::NamespaceRef;
 use crate::optimize::{optimize_into_ast, OptimizationLevel};
 use crate::token::{
-    is_keyword_function, is_valid_identifier, Token, TokenStream, TokenizerControl,
+    is_keyword_function, is_valid_function_name, is_valid_identifier, Token, TokenStream,
+    TokenizerControl,
 };
 use crate::{
     calc_fn_hash, calc_qualified_fn_hash, calc_qualified_var_hash, Engine, Identifier,
@@ -478,7 +479,7 @@ fn parse_fn_call(
                 },
             );
 
-            let hashes = if is_valid_identifier(id.chars()) {
+            let hashes = if is_valid_function_name(&id) {
                 FnCallHashes::from_script(hash)
             } else {
                 FnCallHashes::from_native(hash)
@@ -528,7 +529,7 @@ fn parse_fn_call(
                     },
                 );
 
-                let hashes = if is_valid_identifier(id.chars()) {
+                let hashes = if is_valid_function_name(&id) {
                     FnCallHashes::from_script(hash)
                 } else {
                     FnCallHashes::from_native(hash)
@@ -1949,7 +1950,7 @@ fn parse_binary_op(
                 let hash = calc_fn_hash(&s, 2);
 
                 FnCallExpr {
-                    hashes: if is_valid_identifier(s.chars()) {
+                    hashes: if is_valid_function_name(&s) {
                         FnCallHashes::from_script(hash)
                     } else {
                         FnCallHashes::from_native(hash)
diff --git a/src/token.rs b/src/token.rs
index c52a3eb2..e1ff0045 100644
--- a/src/token.rs
+++ b/src/token.rs
@@ -960,7 +960,7 @@ impl Token {
     #[inline]
     pub(crate) fn into_function_name_for_override(self) -> Result<String, Self> {
         match self {
-            Self::Custom(s) | Self::Identifier(s) if is_valid_identifier(s.chars()) => Ok(s),
+            Self::Custom(s) | Self::Identifier(s) if is_valid_function_name(&s) => Ok(s),
             _ => Err(self),
         }
     }
@@ -2015,6 +2015,13 @@ pub fn is_valid_identifier(name: impl Iterator<Item = char>) -> bool {
     first_alphabetic
 }
 
+/// Is a text string a valid scripted function name?
+#[inline(always)]
+#[must_use]
+pub fn is_valid_function_name(name: &str) -> bool {
+    is_valid_identifier(name.chars())
+}
+
 /// Is a character valid to start an identifier?
 #[cfg(feature = "unicode-xid-ident")]
 #[inline(always)]