diff --git a/tiny_gltf.h b/tiny_gltf.h
index fa16ec5..b2c76b9 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -664,6 +664,8 @@ struct Image {
     width = -1;
     height = -1;
     component = -1;
+    bits = -1;
+    pixel_type = -1;
   }
   DEFAULT_METHODS(Image)
 
@@ -996,6 +998,7 @@ struct Primitive {
   Primitive() {
     material = -1;
     indices = -1;
+    mode = -1;
   }
   DEFAULT_METHODS(Primitive)
   bool operator==(const Primitive &) const;