diff --git a/src/emdawnwebgpu/tests/FuturesTests.cpp b/src/emdawnwebgpu/tests/FuturesTests.cpp
index aae545bd1..296ccea1 100644
--- a/src/emdawnwebgpu/tests/FuturesTests.cpp
+++ b/src/emdawnwebgpu/tests/FuturesTests.cpp
@@ -26,6 +26,7 @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <dawn/webgpu_cpp_print.h>
+#include <emscripten.h>
 #include <gmock/gmock.h>
 #include <gtest/gtest.h>
 #include <webgpu/webgpu_cpp.h>
@@ -50,6 +51,14 @@
 
   protected:
     wgpu::Adapter RequestAdapter(const wgpu::RequestAdapterOptions* adapterOptions = nullptr) {
+        // TODO(crbug.com/404535888): Remove this sleep once we figure out regression.
+        static bool sSleepWorkaround = false;
+        if (!sSleepWorkaround) {
+            // Make the test sleep for an additional 2 seconds before trying to requestAdapter.
+            emscripten_sleep(2000);
+            sSleepWorkaround = true;
+        }
+
         wgpu::RequestAdapterStatus status;
         wgpu::Adapter result = nullptr;
         EXPECT_EQ(instance.WaitAny(