diff --git a/src/lib.rs b/src/lib.rs
index 703bbb1..24983fe 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -226,7 +226,7 @@ mod tests {
 
     #[test]
     fn pin_id_path() {
-        for i in 0..u8::MAX {
+        for i in 0..=u8::MAX {
             assert_eq!(Ok(PinId(i)), PinId::from_path(PinId(i).path().as_ref()))
         }
     }