diff --git a/CHANGELOG.md b/CHANGELOG.md
index 18f47ad..3ee3c7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@
 
 ### Fixed
 - [#38](https://github.com/tweag/nixtract/pull/38) fixed bug where found derivations were parsed incorrectly
+- [#42](https://github.com/tweag/nixtract/pull/42) reintroduced the src field in the derivation description
 
 ### Changed
 - [#36](https://github.com/tweag/nixtract/pull/36) moved all nixtract configuration options into a single struct passed to the `nixtract` function
diff --git a/src/lib.rs b/src/lib.rs
index b07eabb..9594d26 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -229,3 +229,65 @@ pub fn nixtract(
 
     Ok(rx.into_iter())
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use core::panic;
+    use std::fs;
+
+    fn init() {
+        let _ = env_logger::builder().is_test(true).try_init();
+    }
+
+    #[test]
+    fn test_main_fixtures() -> Result<()> {
+        init();
+
+        // For every subdirectory in the tests/fixtures directory
+        for entry in fs::read_dir("tests/fixtures").unwrap() {
+            let entry = entry.unwrap();
+            let path = entry.path().canonicalize().unwrap();
+            if path.is_dir() {
+                let config = NixtractConfig {
+                    runtime_only: false,
+                    binary_caches: None,
+                    offline: false,
+                    include_nar_info: false,
+                    message_tx: None,
+                };
+
+                log::info!("Running test for {:?}", path);
+
+                let test_name = path
+                    .components()
+                    .last()
+                    .unwrap()
+                    .as_os_str()
+                    .to_str()
+                    .unwrap();
+                let flake_ref = path.to_str().unwrap();
+                let system: Option<String> = None;
+                let attribute_path: Option<String> = None;
+
+                let mut descriptions = nixtract(flake_ref, system, attribute_path, config).unwrap();
+
+                match test_name {
+                    "flake-direct-buildInput" => {}
+                    "flake-direct-nativeBuildInput" => {}
+                    "flake-three-levels" => {}
+                    "flake-trivial-rust" => {
+                        assert!(descriptions.any(|d| {
+                            d.src.is_some_and(|s| {
+                                s.git_repo_url == "https://github.com/hello-lang/Rust.git"
+                            })
+                        }));
+                    }
+                    "flake-trivial" => {}
+                    s => panic!("Unknown test: {}", s),
+                }
+            }
+        }
+        Ok(())
+    }
+}
diff --git a/src/nix/describe_derivation.nix b/src/nix/describe_derivation.nix
index 647e797..718a0a1 100644
--- a/src/nix/describe_derivation.nix
+++ b/src/nix/describe_derivation.nix
@@ -31,6 +31,17 @@ in
   name = targetValue.name;
   parsed_name = (builtins.parseDrvName targetValue.name);
   attribute_path = targetAttributePath;
+
+  src =
+    if targetValue ? src.gitRepoUrl && targetValue ? src.rev
+    then
+      {
+        git_repo_url = targetValue.src.gitRepoUrl;
+        rev = targetValue.src.rev;
+      }
+    else
+      null;
+
   nixpkgs_metadata =
     {
       description = (builtins.tryEval (targetValue.meta.description or "")).value;