diff --git a/src/backup/image_index.rs b/src/backup/image_index.rs
index 329babfe..0c8aa0d7 100644
--- a/src/backup/image_index.rs
+++ b/src/backup/image_index.rs
@@ -19,7 +19,7 @@ pub struct ImageIndexHeader {
 
 // split image into fixed size chunks
 
-pub struct ImageIndex<'a> {
+pub struct ImageIndexWriter<'a> {
     store: &'a mut ChunkStore,
     chunk_size: usize,
     size: usize,
@@ -28,7 +28,7 @@ pub struct ImageIndex<'a> {
     ctime: u64,
 }
 
-impl <'a> ImageIndex<'a> {
+impl <'a> ImageIndexWriter<'a> {
 
     pub fn create(store: &'a mut ChunkStore, path: &Path, size: usize) -> Result<Self, Error> {
 
diff --git a/src/bin/backup-client.rs b/src/bin/backup-client.rs
index 8291331d..4b1de70f 100644
--- a/src/bin/backup-client.rs
+++ b/src/bin/backup-client.rs
@@ -38,7 +38,7 @@ fn backup_file(param: Value, _info: &ApiMethod) -> Result<Value, Error> {
     if stat.st_size <= 0 { bail!("got strange file size '{}'", stat.st_size); }
     let size = stat.st_size as usize;
 
-    let mut index = ImageIndex::create(&mut chunk_store, "test1.idx".as_ref(), size)?;
+    let mut index = ImageIndexWriter::create(&mut chunk_store, "test1.idx".as_ref(), size)?;
 
     tools::file_chunker(file, 64*1024, |pos, chunk| {
         index.add_chunk(pos, chunk)?;