diff --git a/token/client/src/client.rs b/token/client/src/client.rs
index 6ebc769a2d8..c2858f41076 100644
--- a/token/client/src/client.rs
+++ b/token/client/src/client.rs
@@ -192,7 +192,7 @@ pub type ProgramClientResult<T> = Result<T, ProgramClientError>;
 
 /// Generic client interface for programs.
 #[async_trait]
-pub trait ProgramClient<ST>
+pub trait ProgramClient<ST>: Send + Sync
 where
     ST: SendTransaction + SimulateTransaction,
 {