diff --git a/src/completion/history.rs b/src/completion/history.rs
index a29e2b04..bd18f34e 100644
--- a/src/completion/history.rs
+++ b/src/completion/history.rs
@@ -11,10 +11,6 @@ const SELECTION_CHAR: char = '!';
 // It pulls data from the object that contains access to the History
 pub(crate) struct HistoryCompleter<'menu>(&'menu dyn History);
 
-// Safe to implement Send since the HistoryCompleter should only be used when
-// updating the menu and that must happen in the same thread
-unsafe impl Send for HistoryCompleter<'_> {}
-
 fn search_unique(
     completer: &HistoryCompleter,
     line: &str,
diff --git a/src/history/base.rs b/src/history/base.rs
index 6b76a241..7b9c01c1 100644
--- a/src/history/base.rs
+++ b/src/history/base.rs
@@ -175,7 +175,7 @@ impl SearchQuery {
 
 /// Represents a history file or database
 /// Data could be stored e.g. in a plain text file, in a `JSONL` file, in a `SQLite` database
-pub trait History: Send {
+pub trait History: Send + Sync {
     /// save a history item to the database
     /// if given id is None, a new id is created and set in the return value
     /// if given id is Some, the existing entry is updated