diff --git a/src/blupi.cxx b/src/blupi.cxx
index ddee278..4c965f3 100644
--- a/src/blupi.cxx
+++ b/src/blupi.cxx
@@ -23,6 +23,7 @@
 #include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string>
 
 #include "blupi.h"
 #include "button.h"