--- a/src/proto2/Error.hh	Thu Nov 20 20:27:12 2008 +0000
+++ b/src/proto2/Error.hh	Thu Nov 20 22:10:28 2008 +0000
@@ -1,6 +1,9 @@
 #ifndef ERROR_HH
 #define ERROR_HH
 
+#include <stdexcept>
+#include <string>
+
 class Error : public std::exception {
     private:
         const char *message;