diff --git a/src/main.rs b/src/main.rs
index 49cceb0..382c6df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@ extern crate clap;
 extern crate term;
 extern crate sha2;
 extern crate walkdir;
+extern crate generic_array;
 
 use sha2::{Sha256, Digest};
 
@@ -90,8 +91,8 @@ impl Args {
     }
 }
 
-struct FileToProcess<N> {
-    hash: [u8; N],
+struct FileToProcess<N: ArrayLength<u8>> {
+    hash: GenericArray<u8,N>,
     name: String,
     realpath: String,
 }