diff --git a/reactos/drivers/filesystems/ntfs/dirctl.c b/reactos/drivers/filesystems/ntfs/dirctl.c
index ddf5662e80d..60c59a81566 100644
--- a/reactos/drivers/filesystems/ntfs/dirctl.c
+++ b/reactos/drivers/filesystems/ntfs/dirctl.c
@@ -348,14 +348,7 @@ NtfsQueryDirectory(PNTFS_IRP_CONTEXT IrpContext)
                 return STATUS_INSUFFICIENT_RESOURCES;
             }
 
-            Status = RtlUpcaseUnicodeString(&Pattern, SearchPattern, FALSE);
-            if (!NT_SUCCESS(Status))
-            {
-                DPRINT1("RtlUpcaseUnicodeString('%wZ') failed with status 0x%08lx\n", &Pattern, Status);
-                ExFreePoolWithTag(Ccb->DirectorySearchPattern, TAG_NTFS);
-                Ccb->DirectorySearchPattern = NULL;
-                return Status;
-            }
+            memcpy(Ccb->DirectorySearchPattern, SearchPattern->Buffer, SearchPattern->Length);
             Ccb->DirectorySearchPattern[SearchPattern->Length / sizeof(WCHAR)] = 0;
         }
     }
diff --git a/reactos/drivers/filesystems/ntfs/mft.c b/reactos/drivers/filesystems/ntfs/mft.c
index 3e83fe8efaa..3a3f00e0ab9 100644
--- a/reactos/drivers/filesystems/ntfs/mft.c
+++ b/reactos/drivers/filesystems/ntfs/mft.c
@@ -466,6 +466,7 @@ CompareFileName(PUNICODE_STRING FileName,
                 PINDEX_ENTRY_ATTRIBUTE IndexEntry,
                 BOOLEAN DirSearch)
 {
+    BOOLEAN Ret, Alloc = FALSE;
     UNICODE_STRING EntryName;
 
     EntryName.Buffer = IndexEntry->FileName.Name;
@@ -474,7 +475,25 @@ CompareFileName(PUNICODE_STRING FileName,
 
     if (DirSearch)
     {
-        return FsRtlIsNameInExpression(FileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX), NULL);
+        UNICODE_STRING IntFileName;
+        if (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX)
+        {
+            ASSERT(NT_SUCCESS(RtlUpcaseUnicodeString(&IntFileName, FileName, TRUE)));
+            Alloc = TRUE;
+        }
+        else
+        {
+            IntFileName = *FileName;
+        }
+
+        Ret = FsRtlIsNameInExpression(&IntFileName, &EntryName, (IndexEntry->FileName.NameType != NTFS_FILE_NAME_POSIX), NULL);
+
+        if (Alloc)
+        {
+            RtlFreeUnicodeString(&IntFileName);
+        }
+
+        return Ret;
     }
     else
     {