diff --git a/src/business.js b/src/business.js
index a8f0cd0..247232d 100644
--- a/src/business.js
+++ b/src/business.js
@@ -18,7 +18,7 @@ function totalCart(items) {
 
 function normalizeUsername(username) {
   // BUG: replaces only the first space and does not collapse repeated whitespace.
-  return username.trim().toLowerCase().replace(' ', '-');
+  return username.trim().toLowerCase().replace(/\s+/g, '-');
 }
 
 function estimateShipping(weightKg, expedited = false) {