diff --git a/crates/uv-resolver/src/lock.rs b/crates/uv-resolver/src/lock.rs
index 5cea21f08..f20d73b7a 100644
--- a/crates/uv-resolver/src/lock.rs
+++ b/crates/uv-resolver/src/lock.rs
@@ -9,12 +9,12 @@ use std::str::FromStr;
 use rustc_hash::FxHashMap;
 use url::Url;
 
-use distribution_filename::WheelFilename;
+use distribution_filename::{SourceDistFilename, WheelFilename};
 use distribution_types::{
     BuiltDist, DirectUrlBuiltDist, DirectUrlSourceDist, DirectorySourceDist, Dist, FileLocation,
     GitSourceDist, IndexUrl, ParsedArchiveUrl, ParsedGitUrl, PathBuiltDist, PathSourceDist,
-    RegistryBuiltDist, RegistryBuiltWheel, RegistrySourceDist, Resolution, ResolvedDist,
-    ToUrlError,
+    RegistryBuiltDist, RegistryBuiltWheel, RegistrySourceDist, RemoteSource, Resolution,
+    ResolvedDist, ToUrlError,
 };
 use pep440_rs::Version;
 use pep508_rs::{MarkerEnvironment, VerbatimUrl};
@@ -339,7 +339,31 @@ impl Distribution {
                     let source_dist = distribution_types::SourceDist::DirectUrl(direct_dist);
                     Dist::Source(source_dist)
                 }
-                SourceKind::Registry => todo!(),
+                SourceKind::Registry => {
+                    // TODO(charlie): Introduce an error type to the conversion functions.
+                    let filename =
+                        SourceDistFilename::parse(&sdist.url.filename().unwrap(), &self.id.name)
+                            .unwrap();
+                    let file = Box::new(distribution_types::File {
+                        dist_info_metadata: false,
+                        filename: filename.to_string(),
+                        hashes: vec![],
+                        requires_python: None,
+                        size: None,
+                        upload_time_utc_ms: None,
+                        url: FileLocation::AbsoluteUrl(sdist.url.to_string()),
+                        yanked: None,
+                    });
+                    let index = IndexUrl::Url(VerbatimUrl::from_url(self.id.source.url.clone()));
+                    let reg_dist = RegistrySourceDist {
+                        filename,
+                        file,
+                        index,
+                        wheels: vec![],
+                    };
+                    let source_dist = distribution_types::SourceDist::Registry(reg_dist);
+                    Dist::Source(source_dist)
+                }
             };
         }
 
@@ -978,8 +1002,6 @@ impl Wheel {
             .url
             .to_url()
             .map_err(LockError::invalid_file_url)?;
-        // FIXME: Is it guaranteed that there is at least one hash?
-        // If not, we probably need to make this fallible.
         let hash = wheel.file.hashes.first().cloned().map(Hash::from);
         Ok(Wheel {
             url,
diff --git a/crates/uv/tests/lock.rs b/crates/uv/tests/lock.rs
index af8694100..bb6657339 100644
--- a/crates/uv/tests/lock.rs
+++ b/crates/uv/tests/lock.rs
@@ -11,7 +11,7 @@ mod common;
 
 /// Lock a requirement from PyPI.
 #[test]
-fn lock_registry() -> Result<()> {
+fn lock_wheel_registry() -> Result<()> {
     let context = TestContext::new("3.12");
     let requirements_in = context.temp_dir.child("requirements.in");
     requirements_in.write_str("anyio==3.7.0")?;
@@ -163,9 +163,67 @@ fn lock_registry() -> Result<()> {
     Ok(())
 }
 
+/// Lock a requirement from PyPI.
+#[test]
+fn lock_sdist_registry() -> Result<()> {
+    let context = TestContext::new("3.12");
+    let requirements_in = context.temp_dir.child("requirements.in");
+    requirements_in.write_str("netwell")?;
+
+    uv_snapshot!(context
+        .compile()
+        .arg("requirements.in")
+        .arg("--no-deps")
+        .arg("--generate-hashes")
+        .arg("--unstable-uv-lock-file"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+    # This file was autogenerated by uv via the following command:
+    #    uv pip compile --cache-dir [CACHE_DIR] --exclude-newer 2024-03-25T00:00:00Z requirements.in --no-deps --generate-hashes --unstable-uv-lock-file
+    netwell==0.4.0 \
+        --hash=sha256:cd6940614081790099b8fc1fdcf65cb930d54c647ed8bc9ba90dc781cf33926e
+        # via -r requirements.in
+
+    ----- stderr -----
+    Resolved 1 package in [TIME]
+    "###);
+
+    let lock = fs_err::read_to_string(context.temp_dir.join("uv.lock"))?;
+
+    assert_snapshot!(
+        lock, @r###"
+    version = 1
+
+    [[distribution]]
+    name = "netwell"
+    version = "0.4.0"
+    source = "registry+https://pypi.org/simple"
+
+    [distribution.sdist]
+    url = "https://files.pythonhosted.org/packages/9d/01/4aacc00ffd2ed59595769e233baf1e72b3a4034ddabf65ff4ef34e1d487e/netwell-0.4.0.tar.gz"
+    hash = "sha256:cd6940614081790099b8fc1fdcf65cb930d54c647ed8bc9ba90dc781cf33926e"
+    "###
+    );
+
+    // Install from the lockfile.
+    uv_snapshot!(context.install().arg("--unstable-uv-lock-file").arg("netwell"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Downloaded 1 package in [TIME]
+    Installed 1 package in [TIME]
+     + netwell==0.4.0
+    "###);
+
+    Ok(())
+}
+
 /// Lock a Git requirement.
 #[test]
-fn lock_git() -> Result<()> {
+fn lock_sdist_git() -> Result<()> {
     let context = TestContext::new("3.12");
     let requirements_in = context.temp_dir.child("requirements.in");
     requirements_in.write_str("anyio @ git+https://github.com/agronholm/anyio@3.7.0")?;