diff --git a/include/spdlog/fmt/chrono.h b/include/spdlog/fmt/chrono.h
index 2284cda9..1504fc1b 100644
--- a/include/spdlog/fmt/chrono.h
+++ b/include/spdlog/fmt/chrono.h
@@ -7,6 +7,7 @@
 //
 // include bundled or external copy of fmtlib's chrono support
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)
diff --git a/include/spdlog/fmt/compile.h b/include/spdlog/fmt/compile.h
index bf3a49c5..76680934 100644
--- a/include/spdlog/fmt/compile.h
+++ b/include/spdlog/fmt/compile.h
@@ -7,6 +7,7 @@
 //
 // include bundled or external copy of fmtlib's compile-time support
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)
diff --git a/include/spdlog/fmt/fmt.h b/include/spdlog/fmt/fmt.h
index a8e7ffba..6177e673 100644
--- a/include/spdlog/fmt/fmt.h
+++ b/include/spdlog/fmt/fmt.h
@@ -9,6 +9,7 @@
 // Include a bundled header-only copy of fmtlib or an external one.
 // By default, spdlog include its own copy.
 //
+#include <spdlog/tweakme.h>
 
 #if defined(SPDLOG_USE_STD_FORMAT)  // use std::format
     #include <format>
diff --git a/include/spdlog/fmt/ostr.h b/include/spdlog/fmt/ostr.h
index 2bb1f28d..077016a4 100644
--- a/include/spdlog/fmt/ostr.h
+++ b/include/spdlog/fmt/ostr.h
@@ -7,6 +7,7 @@
 //
 // include bundled or external copy of fmtlib's ostream support
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)
diff --git a/include/spdlog/fmt/ranges.h b/include/spdlog/fmt/ranges.h
index a7a75e66..3fbcded4 100644
--- a/include/spdlog/fmt/ranges.h
+++ b/include/spdlog/fmt/ranges.h
@@ -7,6 +7,7 @@
 //
 // include bundled or external copy of fmtlib's ranges support
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)
diff --git a/include/spdlog/fmt/std.h b/include/spdlog/fmt/std.h
index ae426a08..ef54fb9b 100644
--- a/include/spdlog/fmt/std.h
+++ b/include/spdlog/fmt/std.h
@@ -8,6 +8,7 @@
 // include bundled or external copy of fmtlib's std support (for formatting e.g.
 // std::filesystem::path, std::thread::id, std::monostate, std::variant, ...)
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)
diff --git a/include/spdlog/fmt/xchar.h b/include/spdlog/fmt/xchar.h
index 499dd797..4e0efd6b 100644
--- a/include/spdlog/fmt/xchar.h
+++ b/include/spdlog/fmt/xchar.h
@@ -7,6 +7,7 @@
 //
 // include bundled or external copy of fmtlib's xchar support
 //
+#include <spdlog/tweakme.h>
 
 #if !defined(SPDLOG_USE_STD_FORMAT)
     #if !defined(SPDLOG_FMT_EXTERNAL)