diff --git a/engine/client/sys_win.c b/engine/client/sys_win.c
index 4d5e4371..bdf141be 100644
--- a/engine/client/sys_win.c
+++ b/engine/client/sys_win.c
@@ -1124,7 +1124,8 @@ void Sys_SendKeyEvents (void)
 void Sys_ServerActivity(void)
 {
 #ifndef SERVERONLY
-	FlashWindow(mainwindow, true);
+	if (GetActiveWindow() != mainwindow)
+		FlashWindow(mainwindow, true);
 #endif
 }
 
diff --git a/engine/server/sv_sys_win.c b/engine/server/sv_sys_win.c
index bb9b53bb..f688afa0 100644
--- a/engine/server/sv_sys_win.c
+++ b/engine/server/sv_sys_win.c
@@ -965,7 +965,7 @@ void Sys_ServerActivity(void)
 #undef STRINGF
 	}
 
-	if (wnd)
+	if (wnd && GetActiveWindow() != wnd)
 		FlashWindow(wnd, true);
 }