diff --git a/src/rstd/atomic.rs b/src/rstd/atomic.rs
index 822aec7..7a506a5 100644
--- a/src/rstd/atomic.rs
+++ b/src/rstd/atomic.rs
@@ -2,6 +2,7 @@
 //! simple static types, which are completely [Context]-independent.
 
 pub mod atomic_object;
+pub mod au64;
 pub mod boolean;
 pub mod plain;
 
diff --git a/src/rstd/atomic/au64.rs b/src/rstd/atomic/au64.rs
new file mode 100644
index 0000000..cfae36f
--- /dev/null
+++ b/src/rstd/atomic/au64.rs
@@ -0,0 +1,50 @@
+use crate::rstd::inlining::*;
+
+use super::*;
+
+impl Serializable for u64 {
+    fn serialize(&self, serializer: &mut dyn Serializer) {
+        serializer.write(&self.to_le_bytes());
+    }
+}
+
+#[derive(Debug, PartialEq)]
+pub enum IntParseError {
+    Eof,
+    ExtraData(usize),
+}
+
+impl Display for IntParseError {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        match self {
+            Self::Eof => f.write_fmt(format_args!("encountered EOF write parsing an integer.")),
+            Self::ExtraData(length) => f.write_fmt(format_args!(
+                "encountered extra data of length {length} while parsing an integer.",
+            )),
+        }
+    }
+}
+
+impl Error for IntParseError {}
+
+impl From<&[u8]> for IntParseError {
+    fn from(_value: &[u8]) -> Self {
+        Self::Eof
+    }
+}
+
+impl Atomic for u64 {
+    type AParseError = IntParseError;
+
+    fn a_deserialize(deserializer: &mut dyn Deserializer) -> Result<Self, Self::AParseError> {
+        Ok(u64::from_le_bytes(deserializer.read_n_const::<8>()?))
+    }
+
+    fn a_unexpected_tail(tail: &[u8]) -> Self::AParseError {
+        IntParseError::ExtraData(tail.len())
+    }
+}
+
+impl ConstSizeAtomic for u64 {
+    const SIZE: usize = 8;
+}