diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
index 246e38171..ac5994eb3 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonGraphic.cs
@@ -572,13 +572,25 @@ namespace Spine.Unity {
 		/// <summary>When enabled, Transform rotation is applied to skeleton PhysicsConstraints.</summary>
 		public bool applyRotationToPhysics = true;
 		/// <summary>Reference transform relative to which physics movement will be calculated, or null to use world location.</summary>
-		public Transform physicsMovementRelativeTo = null;
+		[SerializeField] protected Transform physicsMovementRelativeTo = null;
 
 		/// <summary>Used for applying Transform translation to skeleton PhysicsConstraints.</summary>
 		protected Vector2 lastPosition;
 		/// <summary>Used for applying Transform rotation to skeleton PhysicsConstraints.</summary>
 		protected float lastRotation;
 
+		/// <summary>Reference transform relative to which physics movement will be calculated, or null to use world location.</summary>
+		public Transform PhysicsMovementRelativeTo {
+			get {
+				return physicsMovementRelativeTo;
+			}
+			set {
+				physicsMovementRelativeTo = value;
+				if (applyTranslationToPhysics) ResetLastPosition();
+				if (applyRotationToPhysics) ResetLastRotation();
+			}
+		}
+
 		public void ResetLastPosition () {
 			lastPosition = GetPhysicsTransformPosition();
 		}
diff --git a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
index 51cebc816..a07f2cde4 100644
--- a/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
+++ b/spine-unity/Assets/Spine/Runtime/spine-unity/Components/SkeletonRenderer.cs
@@ -294,13 +294,25 @@ namespace Spine.Unity {
 		/// <summary>When enabled, Transform rotation is applied to skeleton PhysicsConstraints.</summary>
 		public bool applyRotationToPhysics = true;
 		/// <summary>Reference transform relative to which physics movement will be calculated, or null to use world location.</summary>
-		public Transform physicsMovementRelativeTo = null;
+		[SerializeField] protected Transform physicsMovementRelativeTo = null;
 
 		/// <summary>Used for applying Transform translation to skeleton PhysicsConstraints.</summary>
 		protected Vector2 lastPosition;
 		/// <summary>Used for applying Transform rotation to skeleton PhysicsConstraints.</summary>
 		protected float lastRotation;
 
+		/// <summary>Reference transform relative to which physics movement will be calculated, or null to use world location.</summary>
+		public Transform PhysicsMovementRelativeTo {
+			get {
+				return physicsMovementRelativeTo;
+			}
+			set {
+				physicsMovementRelativeTo = value;
+				if (applyTranslationToPhysics) ResetLastPosition();
+				if (applyRotationToPhysics) ResetLastRotation();
+			}
+		}
+
 		public void ResetLastPosition () {
 			lastPosition = GetPhysicsTransformPosition();
 		}