diff --git a/src/gpio/erased.rs b/src/gpio/erased.rs
index a59dfe5..62ffa67 100644
--- a/src/gpio/erased.rs
+++ b/src/gpio/erased.rs
@@ -51,7 +51,7 @@ impl<MODE> PinExt for ErasedPin<MODE> {
 impl<MODE> ErasedPin<MODE> {
     pub(crate) fn new(port: u8, pin: u8) -> Self {
         Self {
-            pin_port: port << 4 | pin,
+            pin_port: (port << 4) | pin,
             _mode: PhantomData,
         }
     }