diff --git a/engine/renderer/include/materialcompiler.hpp b/engine/renderer/include/materialcompiler.hpp
index 2608a8a..8b4915c 100755
--- a/engine/renderer/include/materialcompiler.hpp
+++ b/engine/renderer/include/materialcompiler.hpp
@@ -6,12 +6,12 @@
 
 class Material;
 
-constexpr int position_buffer_index = 2;
-constexpr int normal_buffer_index = 3;
-constexpr int texcoord_buffer_index = 4;
-constexpr int tangent_buffer_index = 5;
-constexpr int bitangent_buffer_index = 6;
-constexpr int bone_buffer_index = 7;
+constexpr int position_buffer_index = 0;
+constexpr int normal_buffer_index = 1;
+constexpr int texcoord_buffer_index = 2;
+constexpr int tangent_buffer_index = 3;
+constexpr int bitangent_buffer_index = 4;
+constexpr int bone_buffer_index = 5;
 
 class MaterialCompiler {
 public: