diff --git a/src/certs.rs b/src/certs.rs
index 063f40c..d5d9e1d 100644
--- a/src/certs.rs
+++ b/src/certs.rs
@@ -8,10 +8,11 @@ pub async fn read_certs(
     ca: &PublicKey,
     path: impl AsRef<Path>,
 ) -> anyhow::Result<Vec<Certificate>> {
-    if !path.as_ref().exists() {
+    let ca_dir = path.as_ref().join(ca_dir(ca));
+    if !ca_dir.exists() {
         return Ok(Vec::new());
     }
-    read_dir(path.as_ref().join(ca_dir(ca))).await
+    read_dir(&ca_dir).await
 }
 
 #[instrument]