diff --git a/h2quic/server_test.go b/h2quic/server_test.go
index 2780e5b8a..af399dc74 100644
--- a/h2quic/server_test.go
+++ b/h2quic/server_test.go
@@ -273,7 +273,7 @@ var _ = Describe("H2 server", func() {
 				Expect(err).NotTo(HaveOccurred())
 				close(done)
 			}()
-			time.Sleep(10 * time.Millisecond)
+			time.Sleep(50 * time.Millisecond)
 			err := s.Close()
 			Expect(err).NotTo(HaveOccurred())
 		}, 0.5)
diff --git a/session_test.go b/session_test.go
index 24570f310..bff1117ff 100644
--- a/session_test.go
+++ b/session_test.go
@@ -585,7 +585,7 @@ var _ = Describe("Session", func() {
 					StreamID: 5,
 					Data:     []byte("foobar1"),
 				})
-				time.Sleep(10 * protocol.SmallPacketSendDelay)
+				time.Sleep(20 * protocol.SmallPacketSendDelay)
 				session.queueStreamFrame(&frames.StreamFrame{
 					StreamID: 5,
 					Data:     []byte("foobar2"),
@@ -603,7 +603,7 @@ var _ = Describe("Session", func() {
 					StreamID: 5,
 					Data:     []byte("foobar1"),
 				})
-				time.Sleep(10 * protocol.SmallPacketSendDelay)
+				time.Sleep(20 * protocol.SmallPacketSendDelay)
 				session.queueStreamFrame(&frames.StreamFrame{
 					StreamID: 5,
 					Data:     []byte("foobar2"),