diff --git a/src/storage/storage_device.rs b/src/storage/storage_device.rs
index 098b241..9632d39 100644
--- a/src/storage/storage_device.rs
+++ b/src/storage/storage_device.rs
@@ -75,7 +75,8 @@ impl<'a> StorageDevice<'a> {
             .chars()
             .rev()
             .next()
-            .expect("Storage device name is empty").is_ascii_digit()
+            .expect("Storage device name is empty")
+            .is_ascii_digit()
         {
             format!("{}p{}", self.name, index)
         } else {