diff --git a/src/cargo/core/source_id.rs b/src/cargo/core/source_id.rs
index eec12567f..8c916b7b4 100644
--- a/src/cargo/core/source_id.rs
+++ b/src/cargo/core/source_id.rs
@@ -204,6 +204,17 @@ impl SourceId {
         SourceId::new(SourceKind::Path, url, None)
     }
 
+    /// Creates a `SourceId` from a filesystem path.
+    ///
+    /// `path`: an absolute path.
+    pub fn for_manifest_path(manifest_path: &Path) -> CargoResult<SourceId> {
+        if crate::util::toml::is_embedded(manifest_path) {
+            Self::for_path(manifest_path)
+        } else {
+            Self::for_path(manifest_path.parent().unwrap())
+        }
+    }
+
     /// Creates a `SourceId` from a Git reference.
     pub fn for_git(url: &Url, reference: GitReference) -> CargoResult<SourceId> {
         SourceId::new(SourceKind::Git(reference), url.clone(), None)
diff --git a/src/cargo/core/workspace.rs b/src/cargo/core/workspace.rs
index b988ca668..83662410e 100644
--- a/src/cargo/core/workspace.rs
+++ b/src/cargo/core/workspace.rs
@@ -1817,11 +1817,7 @@ impl<'gctx> Packages<'gctx> {
         match self.packages.entry(manifest_path.to_path_buf()) {
             Entry::Occupied(e) => Ok(e.into_mut()),
             Entry::Vacant(v) => {
-                let source_id = if crate::util::toml::is_embedded(manifest_path) {
-                    SourceId::for_path(manifest_path)?
-                } else {
-                    SourceId::for_path(manifest_path.parent().unwrap())?
-                };
+                let source_id = SourceId::for_manifest_path(manifest_path)?;
                 let manifest = read_manifest(manifest_path, source_id, self.gctx)?;
                 Ok(v.insert(match manifest {
                     EitherManifest::Real(manifest) => {