diff --git a/Cargo.lock b/Cargo.lock
index a8bd1f0..3411db8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -236,6 +236,7 @@ dependencies = [
  "digest",
  "displaydoc",
  "ed25519-compact",
+ "fastcdc",
  "futures",
  "hex",
  "lazy_static",
@@ -309,7 +310,6 @@ dependencies = [
  "digest",
  "displaydoc",
  "enum-as-inner",
- "fastcdc",
  "futures",
  "hex",
  "http-body-util",
diff --git a/attic/Cargo.toml b/attic/Cargo.toml
index 4cf79f2..ceaee24 100644
--- a/attic/Cargo.toml
+++ b/attic/Cargo.toml
@@ -11,6 +11,7 @@ bytes = "1.4.0"
 displaydoc = "0.2.4"
 digest = "0.10.7"
 ed25519-compact = "2.0.4"
+fastcdc = "3.0.3"
 futures = "0.3.28"
 hex = "0.4.3"
 lazy_static = "1.4.0"
@@ -51,11 +52,15 @@ version-compare = "0.2.0"
 
 [features]
 default = [
+	"chunking",
 	"nix_store",
 	"stream",
 	"tokio",
 ]
 
+# Chunking.
+chunking = ["tokio", "dep:async-stream"]
+
 # Native libnixstore bindings.
 #
 # When disabled, the native Rust portions of nix_store can still be used.
diff --git a/server/src/chunking/mod.rs b/attic/src/chunking/mod.rs
similarity index 98%
rename from server/src/chunking/mod.rs
rename to attic/src/chunking/mod.rs
index b567847..00862ef 100644
--- a/server/src/chunking/mod.rs
+++ b/attic/src/chunking/mod.rs
@@ -9,7 +9,7 @@ use fastcdc::ronomon::FastCDC;
 use futures::stream::Stream;
 use tokio::io::AsyncRead;
 
-use attic::stream::read_chunk_async;
+use crate::stream::read_chunk_async;
 
 /// Splits a streams into content-defined chunks.
 ///
diff --git a/attic/src/lib.rs b/attic/src/lib.rs
index 04ff0fd..8cc2cec 100644
--- a/attic/src/lib.rs
+++ b/attic/src/lib.rs
@@ -17,6 +17,8 @@
 
 pub mod api;
 pub mod cache;
+#[cfg(feature = "chunking")]
+pub mod chunking;
 pub mod error;
 pub mod hash;
 pub mod mime;
diff --git a/server/Cargo.toml b/server/Cargo.toml
index ec50929..3fcf108 100644
--- a/server/Cargo.toml
+++ b/server/Cargo.toml
@@ -19,7 +19,7 @@ path = "src/adm/main.rs"
 doc = false
 
 [dependencies]
-attic = { path = "../attic", default-features = false, features = ["stream", "tokio"] }
+attic = { path = "../attic", default-features = false, features = ["chunking", "stream", "tokio"] }
 attic-token = { path = "../token" }
 
 anyhow = "1.0.71"
@@ -37,7 +37,6 @@ derivative = "2.2.0"
 digest = "0.10.7"
 displaydoc = "0.2.4"
 enum-as-inner = "0.6.0"
-fastcdc = "3.0.3"
 futures = "0.3.28"
 hex = "0.4.3"
 http-body-util = "0.1.1"
diff --git a/server/src/api/v1/upload_path.rs b/server/src/api/v1/upload_path.rs
index 4b04601..049795d 100644
--- a/server/src/api/v1/upload_path.rs
+++ b/server/src/api/v1/upload_path.rs
@@ -37,11 +37,11 @@ use attic::api::v1::upload_path::{
     UploadPathNarInfo, UploadPathResult, UploadPathResultKind, ATTIC_NAR_INFO,
     ATTIC_NAR_INFO_PREAMBLE_SIZE,
 };
+use attic::chunking::chunk_stream;
 use attic::hash::Hash;
 use attic::stream::{read_chunk_async, StreamHasher};
 use attic::util::Finally;
 
-use crate::chunking::chunk_stream;
 use crate::database::entity::cache;
 use crate::database::entity::chunk::{self, ChunkState, Entity as Chunk};
 use crate::database::entity::chunkref::{self, Entity as ChunkRef};
diff --git a/server/src/lib.rs b/server/src/lib.rs
index 93f2e0b..0314e69 100644
--- a/server/src/lib.rs
+++ b/server/src/lib.rs
@@ -15,7 +15,6 @@
 
 pub mod access;
 mod api;
-mod chunking;
 pub mod config;
 pub mod database;
 pub mod error;