diff --git a/Program.cs b/Program.cs
index 26aa5cc..48a8c27 100644
--- a/Program.cs
+++ b/Program.cs
@@ -179,7 +179,7 @@ bool isActive() {
 
         void activate(int duration) {
             var sleepDisabled = NativeMethods.ES_CONTINUOUS |
-                                NativeMethods.ES_DISPLAY_REQUIRED;
+                                NativeMethods.ES_SYSTEM_REQUIRED;
             oldState = NativeMethods.SetThreadExecutionState(sleepDisabled);
             if (oldState == 0) {
                 ShowError();