diff --git a/src/utils/base64.cpp b/src/utils/base64.cpp
index dacf99c4..61b98841 100644
--- a/src/utils/base64.cpp
+++ b/src/utils/base64.cpp
@@ -14,6 +14,7 @@
  *   Free Software Foundation, Inc.,
  *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  */
+#include <stdio.h>
 
 #include <sys/types.h>
 #include <cstring>