diff --git a/test/built-ins/Atomics/wait/bigint/waiterlist-order-of-operations-is-fifo.js b/test/built-ins/Atomics/wait/bigint/waiterlist-order-of-operations-is-fifo.js
index 13f67968e31db46ba9a8b9c34418d9f9dcbee7e1..3cf805064048c196ff74efee88d345bbc39b4c2a 100644
--- a/test/built-ins/Atomics/wait/bigint/waiterlist-order-of-operations-is-fifo.js
+++ b/test/built-ins/Atomics/wait/bigint/waiterlist-order-of-operations-is-fifo.js
@@ -58,7 +58,7 @@ const i64a = new BigInt64Array(
 );
 
 $262.agent.broadcast(i64a.buffer);
-$262.agent.sleep(500);
+$262.agent.sleep(100);
 
 // Agents may be started in any order...
 const started = [getReport(), getReport(), getReport()];
diff --git a/test/built-ins/Atomics/wait/waiterlist-order-of-operations-is-fifo.js b/test/built-ins/Atomics/wait/waiterlist-order-of-operations-is-fifo.js
index 2812fadd6e6094f0969323851a90509c7e6f8d41..bbd670bd09e8ac88ff217784dd26fe771f1f4add 100644
--- a/test/built-ins/Atomics/wait/waiterlist-order-of-operations-is-fifo.js
+++ b/test/built-ins/Atomics/wait/waiterlist-order-of-operations-is-fifo.js
@@ -59,7 +59,7 @@ const i32a = new Int32Array(
 );
 
 $262.agent.broadcast(i32a.buffer);
-$262.agent.sleep(500);
+$262.agent.sleep(100);
 
 // Agents may be started in any order...
 const started = [getReport(), getReport(), getReport()];