diff --git a/lib/runtime-core/src/memory/atomic.rs b/lib/runtime-core/src/memory/atomic.rs
index f4ed3d3d0..f14415def 100644
--- a/lib/runtime-core/src/memory/atomic.rs
+++ b/lib/runtime-core/src/memory/atomic.rs
@@ -52,6 +52,7 @@ macro_rules! intcast {
 }
 intcast! { u8 i8 u16 i16 u32 i32 u64 i64 }
 
+#[repr(transparent)]
 pub struct Atomic<T> {
     v: UnsafeCell<Wrapping<T>>,
 }