diff --git a/data/mp/multiplay/script/rules/endconditions.js b/data/mp/multiplay/script/rules/endconditions.js
index 3851057240d..679e83dee43 100644
--- a/data/mp/multiplay/script/rules/endconditions.js
+++ b/data/mp/multiplay/script/rules/endconditions.js
@@ -398,10 +398,9 @@ function activityAlert()
 		console(
 			_("- unit building - research completion - construction of base structures (factories, power plants, laboratories, modules and oil derricks) - dealing damage")
 		);
-		if (getMissionTime() > idleTime)
+		if (getMissionTime() <= -1)
 		{
-			setMissionTime(
-				(playersTeam[selectedPlayer].lastActivity + idleTime - gameTime) / 1000);
+			setMissionTime((playersTeam[selectedPlayer].lastActivity + idleTime - gameTime) / 1000);
 		}
 	}
 	if (playersTeam[selectedPlayer].lastActivity + idleTime / 2 > gameTime)