diff --git a/spine-csharp/src/Animation.cs b/spine-csharp/src/Animation.cs
index 2492e9dca..ee66aabf4 100644
--- a/spine-csharp/src/Animation.cs
+++ b/spine-csharp/src/Animation.cs
@@ -774,8 +774,8 @@ namespace Spine {
 						bone.scaleY = by + (Math.Abs(y) * Math.Sign(by) - by) * alpha;
 						break;
 					case MixBlend.Add:
-						bone.scaleX = (x - bone.data.scaleX) * alpha;
-						bone.scaleY = (y - bone.data.scaleY) * alpha;
+						bone.scaleX += (x - bone.data.scaleX) * alpha;
+						bone.scaleY += (y - bone.data.scaleY) * alpha;
 						break;
 					}
 				} else {
@@ -857,7 +857,7 @@ namespace Spine {
 						bone.scaleX = bx + (Math.Abs(x) * Math.Sign(bx) - bx) * alpha;
 						break;
 					case MixBlend.Add:
-						bone.scaleX = (x - bone.data.scaleX) * alpha;
+						bone.scaleX += (x - bone.data.scaleX) * alpha;
 						break;
 					}
 				} else {
@@ -934,7 +934,7 @@ namespace Spine {
 						bone.scaleY = by + (Math.Abs(y) * Math.Sign(by) - by) * alpha;
 						break;
 					case MixBlend.Add:
-						bone.scaleY = (y - bone.data.scaleY) * alpha;
+						bone.scaleY += (y - bone.data.scaleY) * alpha;
 						break;
 					}
 				} else {
diff --git a/spine-csharp/src/Skeleton.cs b/spine-csharp/src/Skeleton.cs
index b7a454416..175a54101 100644
--- a/spine-csharp/src/Skeleton.cs
+++ b/spine-csharp/src/Skeleton.cs
@@ -28,7 +28,6 @@
  *****************************************************************************/
 
 using System;
-using System.Collections.Generic;
 
 namespace Spine {
 	public class Skeleton {
diff --git a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
index f23bc1109..3c4bc14cd 100644
--- a/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
+++ b/spine-libgdx/spine-libgdx/src/com/esotericsoftware/spine/Animation.java
@@ -743,8 +743,8 @@ public class Animation {
 						bone.scaleY = by + (Math.abs(y) * Math.signum(by) - by) * alpha;
 						break;
 					case add:
-						bone.scaleX = (x - bone.data.scaleX) * alpha;
-						bone.scaleY = (y - bone.data.scaleY) * alpha;
+						bone.scaleX += (x - bone.data.scaleX) * alpha;
+						bone.scaleY += (y - bone.data.scaleY) * alpha;
 					}
 				} else {
 					switch (blend) {
@@ -822,7 +822,7 @@ public class Animation {
 						bone.scaleX = bx + (Math.abs(x) * Math.signum(bx) - bx) * alpha;
 						break;
 					case add:
-						bone.scaleX = (x - bone.data.scaleX) * alpha;
+						bone.scaleX += (x - bone.data.scaleX) * alpha;
 					}
 				} else {
 					switch (blend) {
@@ -895,7 +895,7 @@ public class Animation {
 						bone.scaleY = by + (Math.abs(y) * Math.signum(by) - by) * alpha;
 						break;
 					case add:
-						bone.scaleY = (y - bone.data.scaleY) * alpha;
+						bone.scaleY += (y - bone.data.scaleY) * alpha;
 					}
 				} else {
 					switch (blend) {