diff --git a/tiny_gltf.h b/tiny_gltf.h
index fb2719b..c9203cf 100644
--- a/tiny_gltf.h
+++ b/tiny_gltf.h
@@ -455,7 +455,8 @@ struct Sampler {
 
   Sampler()
       : wrapS(TINYGLTF_TEXTURE_WRAP_REPEAT),
-        wrapT(TINYGLTF_TEXTURE_WRAP_REPEAT) {}
+        wrapT(TINYGLTF_TEXTURE_WRAP_REPEAT),
+        wrapR(TINYGLTF_TEXTURE_WRAP_REPEAT){}
   bool operator==(const Sampler &) const;
 };