diff --git a/migrations/V0015__post_reaction__add_activity_id.sql b/migrations/V0015__post_reaction__add_activity_id.sql
new file mode 100644
index 0000000..534a31a
--- /dev/null
+++ b/migrations/V0015__post_reaction__add_activity_id.sql
@@ -0,0 +1 @@
+ALTER TABLE post_reaction ADD COLUMN activity_id VARCHAR(250) UNIQUE;
diff --git a/migrations/schema.sql b/migrations/schema.sql
index dbe75f5..0d35c7b 100644
--- a/migrations/schema.sql
+++ b/migrations/schema.sql
@@ -51,6 +51,7 @@ CREATE TABLE post_reaction (
     id UUID PRIMARY KEY,
     author_id UUID NOT NULL REFERENCES actor_profile (id) ON DELETE CASCADE,
     post_id UUID NOT NULL REFERENCES post (id) ON DELETE CASCADE,
+    activity_id VARCHAR(250) UNIQUE,
     created_at TIMESTAMP WITH TIME ZONE NOT NULL DEFAULT now(),
     UNIQUE (author_id, post_id)
 );
diff --git a/src/activitypub/receiver.rs b/src/activitypub/receiver.rs
index 0cd75ce..7767d8d 100644
--- a/src/activitypub/receiver.rs
+++ b/src/activitypub/receiver.rs
@@ -389,7 +389,12 @@ pub async fn receive_activity(
                     post.id
                 },
             };
-            create_reaction(db_client, &author.id, &post_id).await?;
+            create_reaction(
+                db_client,
+                &author.id,
+                &post_id,
+                Some(&activity.id),
+            ).await?;
         },
         (FOLLOW, _) => {
             let source_profile = get_or_fetch_profile_by_actor_id(
diff --git a/src/mastodon_api/statuses/views.rs b/src/mastodon_api/statuses/views.rs
index ed84726..513e17b 100644
--- a/src/mastodon_api/statuses/views.rs
+++ b/src/mastodon_api/statuses/views.rs
@@ -233,7 +233,7 @@ async fn favourite(
         return Err(HttpError::NotFoundError("post"));
     };
     let reaction_created = match create_reaction(
-        db_client, &current_user.id, &status_id,
+        db_client, &current_user.id, &status_id, None,
     ).await {
         Ok(_) => {
             post.reaction_count += 1;
diff --git a/src/models/reactions/mod.rs b/src/models/reactions/mod.rs
index 84c032e..ec98503 100644
--- a/src/models/reactions/mod.rs
+++ b/src/models/reactions/mod.rs
@@ -1 +1,2 @@
 pub mod queries;
+mod types;
diff --git a/src/models/reactions/queries.rs b/src/models/reactions/queries.rs
index c528168..3c9d93f 100644
--- a/src/models/reactions/queries.rs
+++ b/src/models/reactions/queries.rs
@@ -9,21 +9,25 @@ use crate::models::posts::queries::{
     get_post_author,
 };
 use crate::utils::id::new_uuid;
+use super::types::DbReaction;
 
 pub async fn create_reaction(
     db_client: &mut impl GenericClient,
     author_id: &Uuid,
     post_id: &Uuid,
-) -> Result<(), DatabaseError> {
+    activity_id: Option<&String>,
+) -> Result<DbReaction, DatabaseError> {
     let transaction = db_client.transaction().await?;
     let reaction_id = new_uuid();
-    transaction.execute(
+    let row = transaction.query_one(
         "
-        INSERT INTO post_reaction (id, author_id, post_id)
-        VALUES ($1, $2, $3)
+        INSERT INTO post_reaction (id, author_id, post_id, activity_id)
+        VALUES ($1, $2, $3, $4)
+        RETURNING post_reaction
         ",
-        &[&reaction_id, &author_id, &post_id],
+        &[&reaction_id, &author_id, &post_id, &activity_id],
     ).await.map_err(catch_unique_violation("reaction"))?;
+    let reaction: DbReaction = row.try_get("post_reaction")?;
     update_reaction_count(&transaction, post_id, 1).await?;
     let post_author = get_post_author(&transaction, post_id).await?;
     if post_author.is_local() && post_author.id != *author_id {
@@ -33,9 +37,9 @@ pub async fn create_reaction(
             &post_author.id,
             post_id,
         ).await?;
-    }
+    };
     transaction.commit().await?;
-    Ok(())
+    Ok(reaction)
 }
 
 pub async fn delete_reaction(
diff --git a/src/models/reactions/types.rs b/src/models/reactions/types.rs
new file mode 100644
index 0000000..0d0869c
--- /dev/null
+++ b/src/models/reactions/types.rs
@@ -0,0 +1,13 @@
+use chrono::{DateTime, Utc};
+use postgres_types::FromSql;
+use uuid::Uuid;
+
+#[derive(FromSql)]
+#[postgres(name = "post_reaction")]
+pub struct DbReaction {
+    pub id: Uuid,
+    pub author_id: Uuid,
+    pub post_id: Uuid,
+    pub activity_id: Option<String>,
+    pub created_at: DateTime<Utc>,
+}