diff --git a/src/bitdht/bdquerymgr.cc b/src/bitdht/bdquerymgr.cc
index f58880e..fb78261 100644
--- a/src/bitdht/bdquerymgr.cc
+++ b/src/bitdht/bdquerymgr.cc
@@ -27,6 +27,7 @@
 #include "bitdht/bdnode.h"
 
 #include <string.h>
+#include <stdio.h>
 #include <stdlib.h>
 
 #include <iostream>