diff --git a/app/code/Magento/Catalog/i18n/en_US.csv b/app/code/Magento/Catalog/i18n/en_US.csv
index de9f5e1975870fe039dc605efbef24ec480d0ca4..a316bac5d35848fe73a608706cfd7f437599bc7a 100644
--- a/app/code/Magento/Catalog/i18n/en_US.csv
+++ b/app/code/Magento/Catalog/i18n/en_US.csv
@@ -615,7 +615,7 @@ Submit,Submit
 "We don't recognize or support this file extension type.","We don't recognize or support this file extension type."
 "Configure Product","Configure Product"
 OK,OK
-"This value does not follow the specified format (for example, 200X300).","This value does not follow the specified format (for example, 200X300)."
+"This value does not follow the specified format (for example, 200x300).","This value does not follow the specified format (for example, 200x300)."
 "Select type of option.","Select type of option."
 "Please add rows to option.","Please add rows to option."
 "Please select items.","Please select items."
diff --git a/app/code/Magento/Catalog/view/adminhtml/web/component/image-size-field.js b/app/code/Magento/Catalog/view/adminhtml/web/component/image-size-field.js
index 3ebd4bdf9c804450d9b4baabffcbfe7aa9b1b9b0..11a1a65cbab4785cca4a3adfd93486d66527a2d4 100644
--- a/app/code/Magento/Catalog/view/adminhtml/web/component/image-size-field.js
+++ b/app/code/Magento/Catalog/view/adminhtml/web/component/image-size-field.js
@@ -26,7 +26,7 @@ define([
 
             return !!(m &&  m[1] > 0 && m[2] > 0);
         },
-        $.mage.__('This value does not follow the specified format (for example, 200X300).')
+        $.mage.__('This value does not follow the specified format (for example, 200x300).')
     );
 
     return Abstract.extend({