diff --git a/include/json/reader.h b/include/json/reader.h
index 189da57..3d8f628 100644
--- a/include/json/reader.h
+++ b/include/json/reader.h
@@ -11,6 +11,7 @@
 # include "value.h"
 #endif // if !defined(JSON_IS_AMALGAMATION)
 # include <deque>
+# include <iosfwd>
 # include <stack>
 # include <string>
 
diff --git a/src/lib_json/json_reader.cpp b/src/lib_json/json_reader.cpp
index 699dc22..0acbcd0 100644
--- a/src/lib_json/json_reader.cpp
+++ b/src/lib_json/json_reader.cpp
@@ -13,6 +13,7 @@
 #include <cstdio>
 #include <cassert>
 #include <cstring>
+#include <istream>
 #include <stdexcept>
 
 #if defined(_MSC_VER)  &&  _MSC_VER >= 1400 // VC++ 8.0