diff --git a/include/pybind11/detail/class.h b/include/pybind11/detail/class.h
index 2df3385553..52f5d79d96 100644
--- a/include/pybind11/detail/class.h
+++ b/include/pybind11/detail/class.h
@@ -9,8 +9,8 @@
 
 #pragma once
 
-#include "../attr.h"
-#include "../options.h"
+#include <pybind11/attr.h>
+#include <pybind11/options.h>
 
 PYBIND11_NAMESPACE_BEGIN(PYBIND11_NAMESPACE)
 PYBIND11_NAMESPACE_BEGIN(detail)
diff --git a/include/pybind11/detail/internals.h b/include/pybind11/detail/internals.h
index f27b0a66d8..09c521a669 100644
--- a/include/pybind11/detail/internals.h
+++ b/include/pybind11/detail/internals.h
@@ -12,10 +12,10 @@
 #include "common.h"
 
 #if defined(PYBIND11_SIMPLE_GIL_MANAGEMENT)
-#    include "../gil.h"
+#    include <pybind11/gil.h>
 #endif
 
-#include "../pytypes.h"
+#include <pybind11/pytypes.h>
 
 #include <exception>
 #include <mutex>
diff --git a/include/pybind11/detail/type_caster_base.h b/include/pybind11/detail/type_caster_base.h
index a3453334a8..9edfe20228 100644
--- a/include/pybind11/detail/type_caster_base.h
+++ b/include/pybind11/detail/type_caster_base.h
@@ -9,9 +9,10 @@
 
 #pragma once
 
-#include "../gil.h"
-#include "../pytypes.h"
-#include "../trampoline_self_life_support.h"
+#include <pybind11/gil.h>
+#include <pybind11/pytypes.h>
+#include <pybind11/trampoline_self_life_support.h>
+
 #include "common.h"
 #include "descr.h"
 #include "dynamic_raw_ptr_cast_if_possible.h"
diff --git a/include/pybind11/eigen/matrix.h b/include/pybind11/eigen/matrix.h
index 8d4342f81b..5cf1f0a2a0 100644
--- a/include/pybind11/eigen/matrix.h
+++ b/include/pybind11/eigen/matrix.h
@@ -9,7 +9,8 @@
 
 #pragma once
 
-#include "../numpy.h"
+#include <pybind11/numpy.h>
+
 #include "common.h"
 
 /* HINT: To suppress warnings originating from the Eigen headers, use -isystem.
diff --git a/include/pybind11/eigen/tensor.h b/include/pybind11/eigen/tensor.h
index 14bb91c40f..0a9d7c2522 100644
--- a/include/pybind11/eigen/tensor.h
+++ b/include/pybind11/eigen/tensor.h
@@ -7,7 +7,8 @@
 
 #pragma once
 
-#include "../numpy.h"
+#include <pybind11/numpy.h>
+
 #include "common.h"
 
 #if defined(__GNUC__) && !defined(__clang__) && !defined(__INTEL_COMPILER)
diff --git a/include/pybind11/stl/filesystem.h b/include/pybind11/stl/filesystem.h
index 935d794815..c16a9ae5c2 100644
--- a/include/pybind11/stl/filesystem.h
+++ b/include/pybind11/stl/filesystem.h
@@ -4,11 +4,11 @@
 
 #pragma once
 
-#include "../pybind11.h"
-#include "../detail/common.h"
-#include "../detail/descr.h"
-#include "../cast.h"
-#include "../pytypes.h"
+#include <pybind11/cast.h>
+#include <pybind11/detail/common.h>
+#include <pybind11/detail/descr.h>
+#include <pybind11/pybind11.h>
+#include <pybind11/pytypes.h>
 
 #include <string>