diff --git a/internal/holsterv4/clock/system_test.go b/internal/holsterv4/clock/system_test.go
index fe8345f..4c7ab2b 100644
--- a/internal/holsterv4/clock/system_test.go
+++ b/internal/holsterv4/clock/system_test.go
@@ -66,7 +66,6 @@ func TestTimerStop(t *testing.T) {
 
 	// Then
 	assert.Equal(t, true, active)
-	time.Sleep(100)
 	select {
 	case <-timer.C():
 		assert.Fail(t, "Timer should not have fired")
@@ -106,7 +105,6 @@ func TestNewTicker(t *testing.T) {
 	}
 
 	timer.Stop()
-	time.Sleep(150)
 	select {
 	case <-timer.C():
 		assert.Fail(t, "Ticker should not have fired")