diff --git a/libs/binder/UtilsHost.h b/libs/binder/UtilsHost.h
index b582f17..d6fe9fa 100644
--- a/libs/binder/UtilsHost.h
+++ b/libs/binder/UtilsHost.h
@@ -16,6 +16,7 @@
 
 #pragma once
 
+#include <functional>
 #include <optional>
 #include <ostream>
 #include <string>
diff --git a/libs/binder/tests/format.h b/libs/binder/tests/format.h
index b5440a4..c588de7 100644
--- a/libs/binder/tests/format.h
+++ b/libs/binder/tests/format.h
@@ -18,7 +18,7 @@
 // ETA for this blocker is 2023-10-27~2023-11-10.
 // Also, remember to remove fmtlib's format.cc from trusty makefiles.
 
-#if __has_include(<format>)
+#if __has_include(<format>) && !defined(_LIBCPP_HAS_NO_INCOMPLETE_FORMAT)
 #include <format>
 #else
 #include <fmt/format.h>