diff --git a/codex-rs/core/src/plugins/marketplace_add.rs b/codex-rs/core/src/plugins/marketplace_add.rs
index 49c1c2e565..b8d1b34d41 100644
--- a/codex-rs/core/src/plugins/marketplace_add.rs
+++ b/codex-rs/core/src/plugins/marketplace_add.rs
@@ -275,9 +275,15 @@ mod tests {
         );
 
         let config = fs::read_to_string(codex_home.path().join(codex_config::CONFIG_TOML_FILE))?;
-        assert!(config.contains("[marketplaces.debug]"));
-        assert!(config.contains("source_type = \"local\""));
-        assert!(config.contains(&format!("source = \"{expected_source}\"")));
+        let config: toml::Value = toml::from_str(&config)?;
+        assert_eq!(
+            config["marketplaces"]["debug"]["source_type"].as_str(),
+            Some("local")
+        );
+        assert_eq!(
+            config["marketplaces"]["debug"]["source"].as_str(),
+            Some(expected_source.as_str())
+        );
         Ok(())
     }
 
diff --git a/codex-rs/core/src/plugins/marketplace_add/source.rs b/codex-rs/core/src/plugins/marketplace_add/source.rs
index 19fec57ade..cb7201c305 100644
--- a/codex-rs/core/src/plugins/marketplace_add/source.rs
+++ b/codex-rs/core/src/plugins/marketplace_add/source.rs
@@ -124,12 +124,14 @@ fn normalize_git_url(url: &str) -> String {
 }
 
 fn looks_like_local_path(source: &str) -> bool {
+    let path = Path::new(source);
     source.starts_with("./")
         || source.starts_with("../")
         || source.starts_with('/')
         || source.starts_with("~/")
         || source == "."
         || source == ".."
+        || path.is_absolute()
 }
 
 fn resolve_local_source_path(source: &str) -> Result<PathBuf, MarketplaceAddError> {
@@ -310,6 +312,20 @@ mod tests {
         assert!(path.is_absolute());
     }
 
+    #[cfg(windows)]
+    #[test]
+    fn windows_absolute_path_source_parses() {
+        let source =
+            parse_marketplace_source(r"C:\temp\marketplace", /*explicit_ref*/ None).unwrap();
+
+        assert_eq!(
+            source,
+            MarketplaceSource::Local {
+                path: PathBuf::from(r"C:\temp\marketplace"),
+            }
+        );
+    }
+
     #[test]
     fn local_file_source_is_rejected() {
         let tempdir = TempDir::new().unwrap();