diff --git a/src/generate/generic.rs b/src/generate/generic.rs
index 8d7a52a1..e7aa3a91 100644
--- a/src/generate/generic.rs
+++ b/src/generate/generic.rs
@@ -34,6 +34,7 @@ pub trait Resettable: RegisterSpec {
 }
 
 /// This structure provides volatile access to registers.
+#[repr(transparent)]
 pub struct Reg<REG: RegisterSpec> {
     register: vcell::VolatileCell<REG::Ux>,
     _marker: marker::PhantomData<REG>,