diff --git a/sensors/radio/setup/WiFiOptimizerPerFloor.h b/sensors/radio/setup/WiFiOptimizerPerFloor.h
index 7d9d3c4..c326850 100644
--- a/sensors/radio/setup/WiFiOptimizerPerFloor.h
+++ b/sensors/radio/setup/WiFiOptimizerPerFloor.h
@@ -149,7 +149,7 @@ namespace WiFiOptimizer {
 					gp.flush();
 					pts.clear();
 					lines.clear();
-					sleep(1);
+					std::this_thread::sleep_for(std::chrono::milliseconds(1));
 				#endif
 
 				// 5) run the optimizer