diff --git a/OpenRA.Mods.RA/SupportPowers/IronCurtainPower.cs b/OpenRA.Mods.RA/SupportPowers/IronCurtainPower.cs
index b817ec938e..62ea72c3ce 100755
--- a/OpenRA.Mods.RA/SupportPowers/IronCurtainPower.cs
+++ b/OpenRA.Mods.RA/SupportPowers/IronCurtainPower.cs
@@ -40,7 +40,9 @@ namespace OpenRA.Mods.RA
 			self.Trait<RenderBuilding>().PlayCustomAnim(self, "active");
 
 			Sound.Play("ironcur9.aud", order.TargetLocation.ToPPos());
-			foreach (var target in UnitsInRange(order.TargetLocation))
+
+			foreach (var target in UnitsInRange(order.TargetLocation)
+				.Where(a => a.Owner.Stances[self.Owner] == Stance.Ally))
 				target.Trait<IronCurtainable>().Activate(target, (Info as IronCurtainPowerInfo).Duration * 25);
 		}
 
diff --git a/mods/ra/rules/structures.yaml b/mods/ra/rules/structures.yaml
index 7c683deb15..10a1843115 100644
--- a/mods/ra/rules/structures.yaml
+++ b/mods/ra/rules/structures.yaml
@@ -207,8 +207,8 @@ IRON:
 		Image: infxicon
 		ChargeTime: 120
 		Description: Invulnerability
-		LongDesc: Makes a group of units invulnerable\nfor 10 seconds.
-		Duration: 10
+		LongDesc: Makes a group of units invulnerable\nfor 15 seconds.
+		Duration: 15
 		SelectTargetSound: slcttgt1.aud
 		BeginChargeSound: ironchg1.aud
 		EndChargeSound: ironrdy1.aud