diff --git a/lib/internal/Magento/Framework/Indexer/etc/indexer.xsd b/lib/internal/Magento/Framework/Indexer/etc/indexer.xsd
index 6a06a4d55ee35..fc38a5206e855 100644
--- a/lib/internal/Magento/Framework/Indexer/etc/indexer.xsd
+++ b/lib/internal/Magento/Framework/Indexer/etc/indexer.xsd
@@ -67,11 +67,11 @@
     <xs:simpleType name="classType">
         <xs:annotation>
             <xs:documentation>
-                Class name can contain only [a-zA-Z\].
+                Class name can contain only [a-zA-Z|\\]+[a-zA-Z0-9\\]+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z\\]+" />
+            <xs:pattern value="[a-zA-Z|\\]+[a-zA-Z0-9\\]+" />
         </xs:restriction>
     </xs:simpleType>
 
diff --git a/lib/internal/Magento/Framework/Mview/etc/mview.xsd b/lib/internal/Magento/Framework/Mview/etc/mview.xsd
index e2f185041962a..dfff4964f6587 100644
--- a/lib/internal/Magento/Framework/Mview/etc/mview.xsd
+++ b/lib/internal/Magento/Framework/Mview/etc/mview.xsd
@@ -51,11 +51,11 @@
     <xs:simpleType name="classType">
         <xs:annotation>
             <xs:documentation>
-                Class name can contain only [a-zA-Z\].
+                Class name can contain only [a-zA-Z|\\]+[a-zA-Z0-9\\]+.
             </xs:documentation>
         </xs:annotation>
         <xs:restriction base="xs:string">
-            <xs:pattern value="[a-zA-Z\\]+" />
+            <xs:pattern value="[a-zA-Z|\\]+[a-zA-Z0-9\\]+" />
         </xs:restriction>
     </xs:simpleType>