diff --git a/include/rapidjson/istreamwrapper.h b/include/rapidjson/istreamwrapper.h
index c73586e6..f5fe2897 100644
--- a/include/rapidjson/istreamwrapper.h
+++ b/include/rapidjson/istreamwrapper.h
@@ -12,6 +12,9 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 // specific language governing permissions and limitations under the License.
 
+#ifndef RAPIDJSON_ISTREAMWRAPPER_H_
+#define RAPIDJSON_ISTREAMWRAPPER_H_
+
 #include "stream.h"
 #include <iosfwd>
 
@@ -108,3 +111,5 @@ RAPIDJSON_DIAG_POP
 #endif
 
 RAPIDJSON_NAMESPACE_END
+
+#endif // RAPIDJSON_ISTREAMWRAPPER_H_
diff --git a/include/rapidjson/ostreamwrapper.h b/include/rapidjson/ostreamwrapper.h
index 8bf36dcd..6f4667c0 100644
--- a/include/rapidjson/ostreamwrapper.h
+++ b/include/rapidjson/ostreamwrapper.h
@@ -12,6 +12,9 @@
 // CONDITIONS OF ANY KIND, either express or implied. See the License for the 
 // specific language governing permissions and limitations under the License.
 
+#ifndef RAPIDJSON_OSTREAMWRAPPER_H_
+#define RAPIDJSON_OSTREAMWRAPPER_H_
+
 #include "stream.h"
 #include <iosfwd>
 
@@ -74,3 +77,5 @@ RAPIDJSON_DIAG_POP
 #endif
 
 RAPIDJSON_NAMESPACE_END
+
+#endif // RAPIDJSON_OSTREAMWRAPPER_H_