diff --git a/tile/base/internal/format.h b/tile/base/internal/format.h
index e42b093..877dc3a 100644
--- a/tile/base/internal/format.h
+++ b/tile/base/internal/format.h
@@ -105,9 +105,9 @@ TILE_INSTANCE_CHRONO_FORMAT_AS(std::chrono::years, "y")
 #include "fmt/format.h"
 #include "fmt/ostream.h"
 
-inline std::ostream &operator<<(std::ostream &os, std::nullptr_t) {
-  return os << "nullptr";
-}
+// inline std::ostream &operator<<(std::ostream &os, std::nullptr_t) {
+//   return os << "nullptr";
+// }
 
 // template <typename T,
 //           typename = tile::enable_if_t<
diff --git a/tile/fiber/detail/fiber.cc b/tile/fiber/detail/fiber.cc
index 51fe33f..a250c99 100644
--- a/tile/fiber/detail/fiber.cc
+++ b/tile/fiber/detail/fiber.cc
@@ -46,8 +46,8 @@ struct alignas(hardware_destructive_interference_size) Fiber::FiberContext {
 
 void FiberEntry(fcontext_transfer_t t) {
   std::function<void()> *fn = static_cast<std::function<void()> *>(t.data);
-  TILE_CHECK_NE(t.data, nullptr);
-  TILE_CHECK_NE(t.fctx, nullptr);
+  TILE_CHECK(t.data != nullptr);
+  TILE_CHECK(t.fctx != nullptr);
   Fiber *self = nullptr;
 
   try {
@@ -84,7 +84,7 @@ fcontext_t CreateFiber(void *stack, std::size_t stack_size,
                        std::function<void()> *fn) {
   void *stack_top = static_cast<char *>(stack) + stack_size;
   const fcontext_t fctx = make_fcontext(stack_top, stack_size, FiberEntry);
-  TILE_CHECK_NE(fctx, nullptr);
+  TILE_CHECK(fctx != nullptr);
 
   return jump_fcontext(fctx, fn).fctx;
 }