diff --git a/src/TiledArray/tensor.h b/src/TiledArray/tensor.h
index e369539c6e..f24621077c 100644
--- a/src/TiledArray/tensor.h
+++ b/src/TiledArray/tensor.h
@@ -27,12 +27,17 @@
 #define TILEDARRAY_TENSOR_H__INCLUDED
 
 #include <TiledArray/block_range.h>
-#include <TiledArray/tensor/operators.h>
-#include <TiledArray/tensor/shift_wrapper.h>
+
 #include <TiledArray/tensor/tensor.h>
+
 #include <TiledArray/tensor/tensor_interface.h>
 #include <TiledArray/tensor/tensor_map.h>
 
+#include <TiledArray/tile_op/tile_interface.h>
+
+#include <TiledArray/tensor/operators.h>
+#include <TiledArray/tensor/shift_wrapper.h>
+
 namespace TiledArray {
 
 // Template aliases for TensorInterface objects
@@ -94,15 +99,15 @@ inline std::ostream& operator<<(std::ostream& os, const T& t) {
   return os;
 }
 
-template<typename T,
-         typename = std::enable_if_t<detail::is_tensor_of_tensor_v<T>>>
-inline std::ostream& operator<<(std::ostream& os, const T& t){
-  os << t.range() << " {" << std::endl; // Outer tensor's range
-  for(auto idx : t.range()){ // Loop over inner tensors
+template <typename T,
+          typename = std::enable_if_t<detail::is_tensor_of_tensor_v<T>>>
+inline std::ostream& operator<<(std::ostream& os, const T& t) {
+  os << t.range() << " {" << std::endl;  // Outer tensor's range
+  for (auto idx : t.range()) {           // Loop over inner tensors
     const auto& inner_t = t(idx);
     os << "  " << idx << ":" << inner_t << std::endl;
   }
-  os << "}"; // End outer tensor
+  os << "}";  // End outer tensor
   return os;
 }