diff --git a/poi/src/main/java/org/apache/poi/poifs/filesystem/DirectoryNode.java b/poi/src/main/java/org/apache/poi/poifs/filesystem/DirectoryNode.java
index ce379d8fcd1..6e7f7508d07 100644
--- a/poi/src/main/java/org/apache/poi/poifs/filesystem/DirectoryNode.java
+++ b/poi/src/main/java/org/apache/poi/poifs/filesystem/DirectoryNode.java
@@ -349,7 +349,7 @@ public Entry getEntry(final String name) throws FileNotFoundException {
         Entry rval = null;
 
         if (name != null) {
-            rval = _byname.get(name.toUpperCase(Locale.ROOT));
+            rval = _byname.get(name);
         }
         if (rval == null) {
             // throw more useful exceptions for known wrong file-extensions