diff --git a/reactos/drivers/filesystems/ntfs/fsctl.c b/reactos/drivers/filesystems/ntfs/fsctl.c
index e3e20f0c040..82356785920 100644
--- a/reactos/drivers/filesystems/ntfs/fsctl.c
+++ b/reactos/drivers/filesystems/ntfs/fsctl.c
@@ -232,6 +232,10 @@ NtfsGetVolumeData(PDEVICE_OBJECT DeviceObject,
         NtfsInfo->BytesPerFileRecord = BootSector->EBPB.ClustersPerMftRecord * NtfsInfo->BytesPerCluster;
     else
         NtfsInfo->BytesPerFileRecord = 1 << (-BootSector->EBPB.ClustersPerMftRecord);
+    if (BootSector->EBPB.ClustersPerIndexRecord > 0)
+        NtfsInfo->BytesPerIndexRecord = BootSector->EBPB.ClustersPerIndexRecord * NtfsInfo->BytesPerCluster;
+    else
+        NtfsInfo->BytesPerIndexRecord = 1 << (-BootSector->EBPB.ClustersPerIndexRecord);
 
     DPRINT("Boot sector information:\n");
     DPRINT("  BytesPerSector:         %hu\n", BootSector->BPB.BytesPerSector);
diff --git a/reactos/drivers/filesystems/ntfs/ntfs.h b/reactos/drivers/filesystems/ntfs/ntfs.h
index 3782c011a86..c21a0a10cd9 100644
--- a/reactos/drivers/filesystems/ntfs/ntfs.h
+++ b/reactos/drivers/filesystems/ntfs/ntfs.h
@@ -63,6 +63,7 @@ typedef struct _NTFS_INFO
     ULARGE_INTEGER MftStart;
     ULARGE_INTEGER MftMirrStart;
     ULONG BytesPerFileRecord;
+    ULONG BytesPerIndexRecord;
 
     ULONGLONG SerialNumber;
     USHORT VolumeLabelLength;