diff --git a/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialExporter.cs b/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialExporter.cs
index 482bb6154..7022c63cd 100644
--- a/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialExporter.cs
+++ b/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialExporter.cs
@@ -154,9 +154,7 @@ namespace UniVRM10
             }
             // Speed unit Conversion
             const float rotationPerSecToRadianPerSec = Mathf.PI * 2f;
-            // Coords conversion
-            const float unityToGltfCoordsConversion = -1f;
-            mtoon.UvAnimationRotationSpeedFactor = context.UvAnimationRotationSpeedFactor * rotationPerSecToRadianPerSec * unityToGltfCoordsConversion;
+            mtoon.UvAnimationRotationSpeedFactor = context.UvAnimationRotationSpeedFactor * rotationPerSecToRadianPerSec;
 
             // Texture Transforms
             var scale = context.TextureScale;
diff --git a/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialImporter.cs b/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialImporter.cs
index aa2ccb4a8..83d4fa9f6 100644
--- a/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialImporter.cs
+++ b/Assets/VRM10/Runtime/IO/Material/Vrm10MToonMaterialImporter.cs
@@ -226,9 +226,7 @@ namespace UniVRM10
             {
                 // Speed unit Conversion
                 const float radianPerSecToRotationPerSec = 1f / (Mathf.PI * 2f);
-                // Coords conversion
-                const float gltfToUnityCoordsConversion = -1f;
-                yield return (MToon10Prop.UvAnimationRotationSpeedFactor.ToUnityShaderLabName(), uvAnimSpeedRotation.Value * radianPerSecToRotationPerSec * gltfToUnityCoordsConversion);
+                yield return (MToon10Prop.UvAnimationRotationSpeedFactor.ToUnityShaderLabName(), uvAnimSpeedRotation.Value * radianPerSecToRotationPerSec);
             }
 
             // UI