diff --git a/pcbnew/dsn.h b/pcbnew/dsn.h
index 10c6ae305d..f100c05bfc 100644
--- a/pcbnew/dsn.h
+++ b/pcbnew/dsn.h
@@ -26,6 +26,7 @@
 #define _DSN_H
  
 #include <cstdio>
+#include <string>
 
 #include "fctsys.h"
 #include "pcbnew.h"