diff --git a/src/binstall/install.rs b/src/binstall/install.rs
index 6c1830ea..9df6013a 100644
--- a/src/binstall/install.rs
+++ b/src/binstall/install.rs
@@ -109,12 +109,8 @@ async fn install_from_package(
 
         let bins: BTreeSet<String> = bin_files.into_iter().map(|bin| bin.base_name).collect();
 
-        {
-            debug!("Writing .crates.toml");
-            let mut c1 = metafiles::v1::CratesToml::load().unwrap_or_default();
-            c1.insert(cvs.clone(), bins.clone());
-            c1.write()?;
-        }
+        debug!("Writing .crates.toml");
+        metafiles::v1::CratesToml::append(cvs.clone(), bins.clone())?;
 
         {
             debug!("Writing .crates2.json");
diff --git a/src/metafiles/v1.rs b/src/metafiles/v1.rs
index 1180814a..12e34641 100644
--- a/src/metafiles/v1.rs
+++ b/src/metafiles/v1.rs
@@ -42,6 +42,25 @@ impl CratesToml {
         fs::write(path, &toml::to_vec(&self)?)?;
         Ok(())
     }
+
+    pub fn append_to_path(
+        path: impl AsRef<Path>,
+        cvs: CrateVersionSource,
+        bins: BTreeSet<String>,
+    ) -> Result<(), CratesTomlParseError> {
+        let mut c1 = Self::load_from_path(path.as_ref()).unwrap_or_default();
+        c1.insert(cvs, bins);
+        c1.write_to_path(path.as_ref())?;
+
+        Ok(())
+    }
+
+    pub fn append(
+        cvs: CrateVersionSource,
+        bins: BTreeSet<String>,
+    ) -> Result<(), CratesTomlParseError> {
+        Self::append_to_path(Self::default_path()?, cvs, bins)
+    }
 }
 
 impl FromStr for CratesToml {