diff --git a/Gruntfile.js b/Gruntfile.js
index c5b15a7..dda4a9e 100644
--- a/Gruntfile.js
+++ b/Gruntfile.js
@@ -60,7 +60,7 @@
             '<%= dirs.src %>/extras/Rope.js',
             '<%= dirs.src %>/extras/TilingSprite.js',
             '<%= dirs.src %>/extras/Spine.js',
-			'<%= dirs.src %>/extras/PIXISpine.js',
+            '<%= dirs.src %>/extras/PIXISpine.js',
             '<%= dirs.src %>/textures/BaseTexture.js',
             '<%= dirs.src %>/textures/Texture.js',
             '<%= dirs.src %>/textures/RenderTexture.js',