diff --git a/apps/frontend/src/components/auth/register.tsx b/apps/frontend/src/components/auth/register.tsx
index 0f3d3cb4..cd10c7a8 100644
--- a/apps/frontend/src/components/auth/register.tsx
+++ b/apps/frontend/src/components/auth/register.tsx
@@ -65,7 +65,7 @@ export function Register() {
   );
 }
 
-function getHelpfulReasonForRegistrationFailure(httpCode) {
+function getHelpfulReasonForRegistrationFailure(httpCode: int) {
   switch (httpCode) {
     case 400:
       return 'Email already exists';