diff --git a/lib/auth/auth.go b/lib/auth/auth.go
index 7fd4b8d5002bf..d4fe09e2ecbac 100644
--- a/lib/auth/auth.go
+++ b/lib/auth/auth.go
@@ -1191,6 +1191,7 @@ func (a *Server) syncUpgradeWindowStartHour(ctx context.Context) error {
 	agentWindow, _ := cmc.GetAgentUpgradeWindow()
 
 	agentWindow.UTCStartHour = uint32(startHour)
+	agentWindow.Weekdays = []string{"Mon", "Tue", "Wed", "Thu"}
 
 	cmc.SetAgentUpgradeWindow(agentWindow)
 
diff --git a/lib/auth/init_test.go b/lib/auth/init_test.go
index e908d48412d24..e6f8a1e8948c4 100644
--- a/lib/auth/init_test.go
+++ b/lib/auth/init_test.go
@@ -1545,6 +1545,7 @@ func TestSyncUpgradeWindowStartHour(t *testing.T) {
 	require.True(t, ok)
 
 	require.Equal(t, uint32(0), agentWindow.UTCStartHour)
+	require.Equal(t, []string{"Mon", "Tue", "Wed", "Thu"}, agentWindow.Weekdays)
 
 	// change the served hour
 	mu.Lock()