diff --git a/OpenRA.Mods.Common/Traits/Crates/Crate.cs b/OpenRA.Mods.Common/Traits/Crates/Crate.cs
index 213d7581de..ee09ad83e0 100644
--- a/OpenRA.Mods.Common/Traits/Crates/Crate.cs
+++ b/OpenRA.Mods.Common/Traits/Crates/Crate.cs
@@ -61,7 +61,8 @@ namespace OpenRA.Mods.Common.Traits
 
 		void INotifyCrushed.OnCrush(Actor self, Actor crusher, HashSet<string> crushClasses)
 		{
-			if (!CrushableBy(crushClasses, crusher.Owner))
+			// Crate can only be crushed if it is not in the air.
+			if (!self.IsAtGroundLevel() || !crushClasses.Contains(info.CrushClass))
 				return;
 
 			OnCrushInner(crusher);
@@ -84,7 +85,8 @@ namespace OpenRA.Mods.Common.Traits
 					return false;
 
 				// Make sure that the actor can collect this crate type
-				return CrushableBy(mi.Crushes, a.Owner);
+				// Crate can only be crushed if it is not in the air.
+				return self.IsAtGroundLevel() && mi.Crushes.Contains(info.CrushClass);
 			});
 
 			// Destroy the crate if none of the units in the cell are valid collectors
@@ -196,7 +198,7 @@ namespace OpenRA.Mods.Common.Traits
 			return GetAvailableSubCell(a, SubCell.Any, ignoreActor, checkTransientActors) != SubCell.Invalid;
 		}
 
-		public bool CrushableBy(HashSet<string> crushClasses, Player owner)
+		bool ICrushable.CrushableBy(HashSet<string> crushClasses, Player owner)
 		{
 			// Crate can only be crushed if it is not in the air.
 			return self.IsAtGroundLevel() && crushClasses.Contains(info.CrushClass);
diff --git a/OpenRA.Mods.Common/Traits/Crushable.cs b/OpenRA.Mods.Common/Traits/Crushable.cs
index 6d4f4e0ee7..16f8e5466c 100644
--- a/OpenRA.Mods.Common/Traits/Crushable.cs
+++ b/OpenRA.Mods.Common/Traits/Crushable.cs
@@ -42,7 +42,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		void INotifyCrushed.WarnCrush(Actor self, Actor crusher, HashSet<string> crushClasses)
 		{
-			if (!CrushableBy(crushClasses, crusher.Owner))
+			if (!CrushableInner(crushClasses, crusher.Owner))
 				return;
 
 			var mobile = self.TraitOrDefault<Mobile>();
@@ -52,7 +52,7 @@ namespace OpenRA.Mods.Common.Traits
 
 		void INotifyCrushed.OnCrush(Actor self, Actor crusher, HashSet<string> crushClasses)
 		{
-			if (!CrushableBy(crushClasses, crusher.Owner))
+			if (!CrushableInner(crushClasses, crusher.Owner))
 				return;
 
 			Game.Sound.Play(info.CrushSound, crusher.CenterPosition);
@@ -71,7 +71,12 @@ namespace OpenRA.Mods.Common.Traits
 			self.Kill(crusher);
 		}
 
-		public bool CrushableBy(HashSet<string> crushClasses, Player crushOwner)
+		bool ICrushable.CrushableBy(HashSet<string> crushClasses, Player crushOwner)
+		{
+			return CrushableInner(crushClasses, crushOwner);
+		}
+
+		bool CrushableInner(HashSet<string> crushClasses, Player crushOwner)
 		{
 			// Only make actor crushable if it is on the ground.
 			if (!self.IsAtGroundLevel())
diff --git a/OpenRA.Mods.RA/Traits/Mine.cs b/OpenRA.Mods.RA/Traits/Mine.cs
index a291c4fb1a..089ffb20dc 100644
--- a/OpenRA.Mods.RA/Traits/Mine.cs
+++ b/OpenRA.Mods.RA/Traits/Mine.cs
@@ -36,7 +36,7 @@ namespace OpenRA.Mods.RA.Traits
 
 		void INotifyCrushed.OnCrush(Actor self, Actor crusher, HashSet<string> crushClasses)
 		{
-			if (!CrushableBy(crushClasses, crusher.Owner))
+			if (!info.CrushClasses.Overlaps(crushClasses))
 				return;
 
 			if (crusher.Info.HasTraitInfo<MineImmuneInfo>() || (self.Owner.Stances[crusher.Owner] == Stance.Ally && info.AvoidFriendly))
@@ -49,7 +49,7 @@ namespace OpenRA.Mods.RA.Traits
 			self.Kill(crusher);
 		}
 
-		public bool CrushableBy(HashSet<string> crushClasses, Player owner)
+		bool ICrushable.CrushableBy(HashSet<string> crushClasses, Player owner)
 		{
 			return info.CrushClasses.Overlaps(crushClasses);
 		}