diff --git a/compiler/rustc_error_messages/src/lib.rs b/compiler/rustc_error_messages/src/lib.rs
index c9e887061305..641defd1eabf 100644
--- a/compiler/rustc_error_messages/src/lib.rs
+++ b/compiler/rustc_error_messages/src/lib.rs
@@ -192,7 +192,7 @@ pub fn fluent_bundle(
     Ok(Some(bundle))
 }
 
-fn register_functions(bundle: &mut FluentBundle) {
+pub fn register_functions<R, M>(bundle: &mut fluent_bundle::bundle::FluentBundle<R, M>) {
     bundle
         .add_function("STREQ", |positional, _named| match positional {
             [FluentValue::String(a), FluentValue::String(b)] => format!("{}", (a == b)).into(),
diff --git a/compiler/rustc_errors/src/translation.rs b/compiler/rustc_errors/src/translation.rs
index aba79c30f3a3..ed3f9a405342 100644
--- a/compiler/rustc_errors/src/translation.rs
+++ b/compiler/rustc_errors/src/translation.rs
@@ -3,8 +3,8 @@ use std::env;
 use std::error::Report;
 use std::sync::Arc;
 
-use rustc_error_messages::langid;
 pub use rustc_error_messages::{FluentArgs, LazyFallbackBundle};
+use rustc_error_messages::{langid, register_functions};
 use tracing::{debug, trace};
 
 use crate::error::{TranslateError, TranslateErrorKind};
@@ -91,6 +91,7 @@ impl Translator {
                 let mut bundle = fluent_bundle::FluentBundle::new(vec![langid!("en-US")]);
                 bundle.set_use_isolating(false);
                 bundle.add_resource(resource).unwrap();
+                register_functions(&mut bundle);
                 let message = bundle.get_message(GENERATED_MSG_ID).unwrap();
                 let value = message.value().unwrap();