diff --git a/network-mux/test/Test/Mux/Timeout.hs b/network-mux/test/Test/Mux/Timeout.hs
index b175816c0ab..e0c52793220 100644
--- a/network-mux/test/Test/Mux/Timeout.hs
+++ b/network-mux/test/Test/Mux/Timeout.hs
@@ -376,7 +376,7 @@ schedulingToleranceIO :: SchedulingTolerance
 schedulingToleranceIO =
     SchedulingTolerance {
       negativeSchedulingTolerance = 0.001,
-      positiveSchedulingTolerance = 0.1,
+      positiveSchedulingTolerance = 0.3,
       maxFailures                 = 5
     }