diff --git a/lib/validate.js b/lib/validate.js
index 81a06c5..872ca36 100644
--- a/lib/validate.js
+++ b/lib/validate.js
@@ -45,7 +45,7 @@ function businessPremisesId (value) {
  *
  */
 function cashRegisterId (value) {
-  if (!/^[0-9a-zA-Z\.,:;/#\-_]{1,20}$/.test(value)) {
+  if (!/^[0-9a-zA-Z\.,:;/#\-_ ]{1,20}$/.test(value)) {
     throw new Error(`Value '${value}' doesn't match pattern for cash register ID.`)
   }
 }