diff --git a/xml/xml-psi-impl/src/com/intellij/xml/util/HTMLControls.java b/xml/xml-psi-impl/src/com/intellij/xml/util/HTMLControls.java
index f8797c6b2273..96381e915d48 100644
--- a/xml/xml-psi-impl/src/com/intellij/xml/util/HTMLControls.java
+++ b/xml/xml-psi-impl/src/com/intellij/xml/util/HTMLControls.java
@@ -108,7 +108,7 @@ public class HTMLControls {
     public Set<String> fromString(@NotNull String value) {
       final THashSet<String> result = new THashSet<String>();
       for (String closingTag : StringUtil.split(value, ",")) {
-        result.add(closingTag.trim());
+        result.add(closingTag.trim().toLowerCase(Locale.US));
       }
       return result;
     }