diff --git a/spine-c/spine-c/src/spine/Bone.c b/spine-c/spine-c/src/spine/Bone.c
index 025725a12..a13d1e1a3 100644
--- a/spine-c/spine-c/src/spine/Bone.c
+++ b/spine-c/spine-c/src/spine/Bone.c
@@ -154,6 +154,8 @@ void spBone_updateWorldTransformWith (spBone* self, float x, float y, float rota
 			za *= s;
 			zc *= s;
 			s = SQRT(za * za + zc * zc);
+			if (self->data->transformMode == SP_TRANSFORMMODE_NOSCALE && (pa * pd - pb * pc < 0) != (sx < 0 != sy < 0))
+				s = -s;
 			r = PI / 2 + ATAN2(zc, za);
 			zb = COS(r) * s;
 			zd = SIN(r) * s;
diff --git a/spine-cpp/spine-cpp/src/spine/Bone.cpp b/spine-cpp/spine-cpp/src/spine/Bone.cpp
index d10fe8312..f235afea2 100644
--- a/spine-cpp/spine-cpp/src/spine/Bone.cpp
+++ b/spine-cpp/spine-cpp/src/spine/Bone.cpp
@@ -183,6 +183,9 @@ Bone::updateWorldTransform(float x, float y, float rotation, float scaleX, float
 			za *= s;
 			zc *= s;
 			s = MathUtil::sqrt(za * za + zc * zc);
+			if (_data.getTransformMode() == TransformMode_NoScale
+				&& (pa * pd - pb * pc < 0) != (_skeleton.getScaleX() < 0 != _skeleton.getScaleY() < 0))
+				s = -s;
 			r = MathUtil::Pi / 2 + MathUtil::atan2(zc, za);
 			zb = MathUtil::cos(r) * s;
 			zd = MathUtil::sin(r) * s;