diff --git a/tests/testmplex.nim b/tests/testmplex.nim
index f92f0c6..a876f33 100644
--- a/tests/testmplex.nim
+++ b/tests/testmplex.nim
@@ -178,6 +178,7 @@ suite "Mplex":
       await stream.writeLp("Hello from stream!")
       await lock or timeout
       check lock.finished
+      timeout.cancel()
       await conn.close()
       check not openState # assert lazy 
       result = true
@@ -217,6 +218,7 @@ suite "Mplex":
       await stream.writeLp(bigseq)
       await lock or timeout
       check timeout.finished # this test has to timeout!
+      lock.cancel();
       await conn.close()
       result = true