diff --git a/Models/Instruments/MCDU/MCDU.nas b/Models/Instruments/MCDU/MCDU.nas
index bca6a117..14e88beb 100644
--- a/Models/Instruments/MCDU/MCDU.nas
+++ b/Models/Instruments/MCDU/MCDU.nas
@@ -775,7 +775,11 @@ var canvas_MCDU_base = {
 					var p = logs[i].state;
 					if (p == 4) p = 3; # RETURN-IN
 					me[rowsC[p]].setText(logs[i].time);
-					me[rowsR[p]].setText(sprintf("%3.1f ",logs[i].fob));
+					if (acconfig_weight_kgs.getValue() == 1) {
+						me[rowsR[p]].setText(sprintf("%3.1f ",logs[i].fob * LBS2KGS));
+					} else {
+						me[rowsR[p]].setText(sprintf("%3.1f ",logs[i].fob));
+					}
 				}
 			}
 
@@ -852,8 +856,8 @@ var canvas_MCDU_base = {
 			me["Simple_R3S"].setText(sprintf("%-10s",(doorL4_pos.getValue() > 0.1) ? "OPEN" : "CLOSED"));
 			me["Simple_R3"].setText(sprintf("%-10s",(doorR4_pos.getValue() > 0.1) ? "OPEN" : "CLOSED"));
 			me["Simple_R4S"].setText(sprintf("%-10s",sprintf("%03.3f",pts.Velocities.groundspeed.getValue())));
-			if (getprop("/options/system/weight-kgs") == 1) {
-				me["Simple_R4"].setText(sprintf("%-10s",sprintf("%03.1f",fmgc.FMGCInternal.fob * LBS2KGS )));
+			if (acconfig_weight_kgs.getValue() == 1) {
+				me["Simple_R4"].setText(sprintf("%-10s",sprintf("%03.1f",fmgc.FMGCInternal.fob * LBS2KGS)));
 			} else {
 				me["Simple_R4"].setText(sprintf("%-10s",sprintf("%03.1f",fmgc.FMGCInternal.fob)));
 			}
diff --git a/Nasal/MCDU/FLIGHTLOG.nas b/Nasal/MCDU/FLIGHTLOG.nas
index b12ac600..e9da0033 100644
--- a/Nasal/MCDU/FLIGHTLOG.nas
+++ b/Nasal/MCDU/FLIGHTLOG.nas
@@ -5,8 +5,8 @@ var OOOIReport = {
 	new: func(state,time=0,fob="") {
 		var report = {parents:[OOOIReport]};
 		report.state = state;
-		if (getprop("/options/system/weight-kgs") == 1) {
-			report.fob = (fob != "") ? fob : fmgc.FMGCInternal.fob * LBS2KGS
+		if (acconfig_weight_kgs.getValue() == 1) {
+			report.fob = (fob != "") ? fob : fmgc.FMGCInternal.fob * LBS2KGS;
 		} else {
 			report.fob = (fob != "") ? fob : fmgc.FMGCInternal.fob;
 		}