diff --git a/include/json/reader.h b/include/json/reader.h
index cb76fab..2d39608 100644
--- a/include/json/reader.h
+++ b/include/json/reader.h
@@ -6,7 +6,7 @@
 # include <deque>
 # include <stack>
 # include <string>
-# include <istream>
+# include <iostream>
 
 namespace Json {
 
diff --git a/include/json/writer.h b/include/json/writer.h
index 1312dbc..ea9716d 100644
--- a/include/json/writer.h
+++ b/include/json/writer.h
@@ -4,7 +4,7 @@
 # include "value.h"
 # include <vector>
 # include <string>
-# include <ostream>
+# include <iostream>
 
 namespace Json {
 
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 91b07c6..529703b 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -3,7 +3,7 @@
 #include <utility>
 #include <stdio.h>
 #include <assert.h>
-#include <istream>
+#include <iostream>
 #include <stdexcept>
 
 #if _MSC_VER >= 1400 // VC++ 8.0
diff --git a/src/lib_json/json_writer.cpp b/src/lib_json/json_writer.cpp
index 5f000df..8af01f3 100644
--- a/src/lib_json/json_writer.cpp
+++ b/src/lib_json/json_writer.cpp
@@ -2,7 +2,7 @@
 #include <utility>
 #include <assert.h>
 #include <stdio.h>
-#include <ostream>
+#include <iostream>
 
 #if _MSC_VER >= 1400 // VC++ 8.0
 #pragma warning( disable : 4996 )   // disable warning about strdup being deprecated.