diff --git a/src/lib.rs b/src/lib.rs
index 6273621..0067f2e 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ mod expand;
 mod helpers;
 mod mapping;
 mod parse;
+mod spanned;
 
 #[proc_macro_derive(Dto, attributes(dto))]
 pub fn dto_macro_derive(input: TokenStream) -> TokenStream {
diff --git a/src/spanned.rs b/src/spanned.rs
new file mode 100644
index 0000000..48afdd2
--- /dev/null
+++ b/src/spanned.rs
@@ -0,0 +1,21 @@
+use proc_macro2::Span;
+use std::ops::Deref;
+
+pub(crate) struct Spanned<T> {
+    pub(crate) inner: T,
+    pub(crate) span: Span,
+}
+
+impl<T> Spanned<T> {
+    pub(crate) fn new(inner: T, span: Span) -> Spanned<T> {
+        Spanned { inner, span }
+    }
+}
+
+impl<T> Deref for Spanned<T> {
+    type Target = T;
+
+    fn deref(&self) -> &Self::Target {
+        &self.inner
+    }
+}