diff --git a/native/src/ffi.rs b/native/src/ffi.rs
index 04cb17e..f16f3c8 100644
--- a/native/src/ffi.rs
+++ b/native/src/ffi.rs
@@ -887,12 +887,21 @@ pub extern "C" fn smol_contact(store: *mut Store, address: *const c_char) -> *mu
         let address = text(address)?;
         #[derive(Serialize)]
         #[serde(rename_all = "camelCase")]
+        // History entries serialize as objects, matching smol_contacts and
+        // the facade's parser — a bare tuple would cross the FFI as a JSON
+        // array and break the first contact that ever gains rotation history.
+        struct History {
+            key: String,
+            until: i64,
+        }
+        #[derive(Serialize)]
+        #[serde(rename_all = "camelCase")]
         struct Out {
             key: String,
             verified: bool,
             active: Option<bool>,
             accepted_key: Option<String>,
-            history: Vec<(String, i64)>,
+            history: Vec<History>,
         }
         let Some((key, verified)) = store.contact(address)? else {
             return Ok(ser(&Out {
@@ -913,7 +922,7 @@ pub extern "C" fn smol_contact(store: *mut Store, address: *const c_char) -> *mu
             history: store
                 .history(address)?
                 .into_iter()
-                .map(|(key, until)| (b32(&key), until))
+                .map(|(key, until)| History { key: b32(&key), until })
                 .collect(),
         })?)
     })