diff --git a/include/msgpack/iterator.hpp b/include/msgpack/iterator.hpp
index a118b592..0f532a4a 100644
--- a/include/msgpack/iterator.hpp
+++ b/include/msgpack/iterator.hpp
@@ -11,8 +11,8 @@
 #ifndef MSGPACK_ITERATOR_HPP
 #define MSGPACK_ITERATOR_HPP
 
-#include <msgpack/iterator_decl.hpp>
+#include "msgpack/iterator_decl.hpp"
 
-#include <msgpack/v1/iterator.hpp>
+#include "msgpack/v1/iterator.hpp"
 
 #endif // MSGPACK_ITERATOR_HPP
diff --git a/include/msgpack/iterator_decl.hpp b/include/msgpack/iterator_decl.hpp
index 5bf28cb1..dc3205c8 100644
--- a/include/msgpack/iterator_decl.hpp
+++ b/include/msgpack/iterator_decl.hpp
@@ -11,8 +11,8 @@
 #ifndef MSGPACK_ITERATOR_DECL_HPP
 #define MSGPACK_ITERATOR_DECL_HPP
 
-#include <msgpack/v1/iterator_decl.hpp>
-#include <msgpack/v2/iterator_decl.hpp>
-#include <msgpack/v3/iterator_decl.hpp>
+#include "msgpack/v1/iterator_decl.hpp"
+#include "msgpack/v2/iterator_decl.hpp"
+#include "msgpack/v3/iterator_decl.hpp"
 
 #endif // MSGPACK_ITERATOR_DECL_HPP
diff --git a/include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp b/include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp
index f9e29ea6..d182e79f 100644
--- a/include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp
+++ b/include/msgpack/v1/adaptor/detail/cpp11_convert_helper.hpp
@@ -12,7 +12,7 @@
 
 #include <tuple>
 
-#include <msgpack/object_fwd.hpp>
+#include "msgpack/object_fwd.hpp"
 
 namespace msgpack {
 /// @cond
diff --git a/include/msgpack/v1/iterator_decl.hpp b/include/msgpack/v1/iterator_decl.hpp
index 1bec2e38..9ae68785 100644
--- a/include/msgpack/v1/iterator_decl.hpp
+++ b/include/msgpack/v1/iterator_decl.hpp
@@ -12,7 +12,7 @@
 #define MSGPACK_V1_ITERATOR_DECL_HPP
 #if !defined(MSGPACK_USE_CPP03)
 
-#include <msgpack/object_fwd.hpp>
+#include "msgpack/object_fwd.hpp"
 
 namespace msgpack {
 
diff --git a/include/msgpack/v2/iterator_decl.hpp b/include/msgpack/v2/iterator_decl.hpp
index c03a3939..49268f64 100644
--- a/include/msgpack/v2/iterator_decl.hpp
+++ b/include/msgpack/v2/iterator_decl.hpp
@@ -12,7 +12,7 @@
 #define MSGPACK_V2_ITERATOR_DECL_HPP
 #if !defined(MSGPACK_USE_CPP03)
 
-#include <msgpack/v1/iterator_decl.hpp>
+#include "msgpack/v1/iterator_decl.hpp"
 
 namespace msgpack {
 
diff --git a/include/msgpack/v3/iterator_decl.hpp b/include/msgpack/v3/iterator_decl.hpp
index 999eb3be..fb7b103b 100644
--- a/include/msgpack/v3/iterator_decl.hpp
+++ b/include/msgpack/v3/iterator_decl.hpp
@@ -12,7 +12,7 @@
 #define MSGPACK_V3_ITERATOR_DECL_HPP
 #if !defined(MSGPACK_USE_CPP03)
 
-#include <msgpack/v2/iterator_decl.hpp>
+#include "msgpack/v2/iterator_decl.hpp"
 
 namespace msgpack {