diff --git a/contrib/libb64/include/libb64/decode.h b/contrib/libb64/include/libb64/decode.h
index 84a3998d7a..696e3f1a4d 100644
--- a/contrib/libb64/include/libb64/decode.h
+++ b/contrib/libb64/include/libb64/decode.h
@@ -9,6 +9,7 @@ For details, see http://sourceforge.net/projects/libb64
 #define BASE64_DECODE_H
 
 #include <iostream>
+#include "libb64/encode.h"
 
 namespace base64 {
 extern "C" {