diff --git a/packages/theme-cart/validate.js b/packages/theme-cart/validate.js
index f33388f..2b45b2e 100644
--- a/packages/theme-cart/validate.js
+++ b/packages/theme-cart/validate.js
@@ -42,7 +42,7 @@ export function options(options) {
     typeof options.properties === 'undefined'
   ) {
     throw new Error(
-      'Theme Cart: You muse define a value for quantity or properties'
+      'Theme Cart: You must define a value for quantity or properties'
     );
   }