diff --git a/NEWS.md b/NEWS.md
index 2692ba55..7f080501 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -4,6 +4,8 @@
 
 - Changed: Show more type parameters in mutant names, like `impl From<&str> for Foo` rather than `impl From for Foo`.
 
+- Fixed: Support crates that use a non-default Cargo registry. Previously, `cargo metadata` failed with "registry index was not found."
+
 ## 25.0.0
 
 - Better estimation of time remaining, based on the time taken to test mutants so far, excluding the time for the baseline.
diff --git a/src/workspace.rs b/src/workspace.rs
index 33594003..79e81db7 100644
--- a/src/workspace.rs
+++ b/src/workspace.rs
@@ -102,6 +102,7 @@ impl Workspace {
         let metadata = cargo_metadata::MetadataCommand::new()
             .no_deps()
             .manifest_path(&manifest_path)
+            .current_dir(&dir)
             .verbose(false)
             .exec()
             .with_context(|| format!("Failed to run cargo metadata on {manifest_path}"))?;