diff --git a/src/db.rs b/src/db.rs
index b2a54e1..cbc0172 100644
--- a/src/db.rs
+++ b/src/db.rs
@@ -344,7 +344,7 @@ pub fn write_event(conn: &mut PooledConnection, e: &Event) -> Result<usize> {
             .filter_map(|x| hex::decode(x).ok())
             .for_each(|x| params.push(Box::new(x)));
         let query = format!(
-            "UPDATE event SET hidden=TRUE WHERE author=?, event_hash IN ({})",
+            "UPDATE event SET hidden=TRUE WHERE author=? AND event_hash IN ({})",
             repeat_vars(params.len() - 1)
         );
         let mut stmt = tx.prepare(&query)?;