diff --git a/simgear/misc/sgstream.cxx b/simgear/misc/sgstream.cxx
index dec7711e..e9b61031 100644
--- a/simgear/misc/sgstream.cxx
+++ b/simgear/misc/sgstream.cxx
@@ -25,6 +25,7 @@
 
 #ifdef SG_HAVE_STD_INCLUDES
 # include <cerrno>
+# include <string>
 #else
 # include <errno.h>
 #endif
diff --git a/simgear/xml/easyxml.cxx b/simgear/xml/easyxml.cxx
index 181e646b..8fc5ca15 100644
--- a/simgear/xml/easyxml.cxx
+++ b/simgear/xml/easyxml.cxx
@@ -2,6 +2,7 @@
 
 #include <simgear/compiler.h>
 
+#include <ostream>
 #include <string.h>		// strcmp()
 
 #include "easyxml.hxx"