diff --git a/src/helm_config.rs b/src/helm_config.rs
index 107b65c..a9ba3ab 100644
--- a/src/helm_config.rs
+++ b/src/helm_config.rs
@@ -12,26 +12,25 @@ pub struct ImageRefs {
 }
 
 impl ImageRefs {
-    pub fn parse(repo: &Repository, diff_file: DiffFile) -> Result<Self, anyhow::Error> {
+    pub fn parse(repo: &Repository, diff_file: &DiffFile) -> Result<Self, anyhow::Error> {
         let blob_id = diff_file.id();
         let blob = repo
             .find_blob(blob_id)
             .with_context(|| format!("cannot find Git blob {blob_id}"))?;
-        Ok(serde_yml::from_slice(blob.content())
-            .with_context(|| format!("cannot parse yaml file {:?}", diff_file.path()))?)
+        serde_yml::from_slice(blob.content()).with_context(|| format!("cannot parse yaml file {:?}", diff_file.path()))
     }
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct ImageRef {
-    pub account:    String,
+    pub account: String,
     pub repository: String,
-    pub tag:        String,
-    pub sources:    Vec<SourceRepoRef>,
+    pub tag: String,
+    pub sources: Vec<SourceRepoRef>,
 }
 
 #[derive(Debug, Serialize, Deserialize)]
 pub struct SourceRepoRef {
-    pub repo:   String,
+    pub repo: String,
     pub commit: String,
 }
diff --git a/src/main.rs b/src/main.rs
index 0ed893f..6ce7abd 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -137,11 +137,11 @@ fn find_values_yaml(workspace: String, base: &str, head: &str) -> Result<Vec<Rep
             continue;
         }
 
-        let new_image_refs = ImageRefs::parse(&repo, new_file)?;
+        let new_image_refs = ImageRefs::parse(&repo, &new_file)?;
 
         let old_file = diff_delta.old_file();
         if old_file.exists() {
-            let old_image_refs = ImageRefs::parse(&repo, old_file)?;
+            let old_image_refs = ImageRefs::parse(&repo, &old_file)?;
 
             for (name, image) in &new_image_refs.container_images {
                 for source in &image.sources {