diff --git a/AssetLoader/interface/GLTFLoader.hpp b/AssetLoader/interface/GLTFLoader.hpp
index f7d40953..81608cd0 100644
--- a/AssetLoader/interface/GLTFLoader.hpp
+++ b/AssetLoader/interface/GLTFLoader.hpp
@@ -220,7 +220,8 @@ struct Material
     struct TransmissionShaderAttribs
     {
         float Factor     = 0;
-        float Padding[3] = {};
+        float IOR        = 1.5f;
+        float Padding[2] = {};
     };
     static_assert(sizeof(TransmissionShaderAttribs) % 16 == 0, "TransmissionShaderAttribs struct must be 16-byte aligned");
     std::unique_ptr<TransmissionShaderAttribs> Transmission;
diff --git a/AssetLoader/src/GLTFLoader.cpp b/AssetLoader/src/GLTFLoader.cpp
index 64f60b5f..4dabe4d8 100644
--- a/AssetLoader/src/GLTFLoader.cpp
+++ b/AssetLoader/src/GLTFLoader.cpp
@@ -1874,6 +1874,12 @@ void Model::LoadMaterials(const tinygltf::Model& gltf_model, const ModelCreateIn
                 const tinygltf::Value& TransExt = ext_it->second;
                 LoadExtensionTexture(gltf_model, *this, TransExt, MatBuilder, TransmissionTextureName);
                 LoadExtensionParameter(TransExt, "transmissionFactor", Mat.Transmission->Factor);
+
+                if (auto IorExtIt = gltf_mat.extensions.find("KHR_materials_ior");
+                    IorExtIt != gltf_mat.extensions.end())
+                {
+                    LoadExtensionParameter(IorExtIt->second, "ior", Mat.Transmission->IOR);
+                }
             }
         }