diff --git a/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs b/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
index e61058ce3..3a7527e96 100644
--- a/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
+++ b/Assets/UniGLTF/Runtime/UniGLTF/IO/GltfData.cs
@@ -339,12 +339,16 @@ namespace UniGLTF
             {
                 return null;
             }
-            var ext = System.IO.Path.GetExtension(uri).ToLower();
+            var ext = System.IO.Path.GetExtension(uri).ToLowerInvariant();
             switch (ext)
             {
-                case ".png": return "image/png";
-                case ".jpg": return "image/jpeg";
-                default: return null;
+                case ".png":
+                    return "image/png";
+                case ".jpg":
+                case ".jpeg":
+                    return "image/jpeg";
+                default:
+                    return null;
             }
         }