diff --git a/libbitdht/src/bitdht/bdquerymgr.cc b/libbitdht/src/bitdht/bdquerymgr.cc
index f58880ea5..fb78261f3 100644
--- a/libbitdht/src/bitdht/bdquerymgr.cc
+++ b/libbitdht/src/bitdht/bdquerymgr.cc
@@ -27,6 +27,7 @@
 #include "bitdht/bdnode.h"
 
 #include <string.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 #include <iostream>