diff --git a/source/src/crypto_tools.cpp b/source/src/crypto_tools.cpp
index 682c9df4..8d2bd0d2 100644
--- a/source/src/crypto_tools.cpp
+++ b/source/src/crypto_tools.cpp
@@ -1,5 +1,6 @@
 #include <time.h>
 #include "crypto_tools.h"
+#include "cube.h"
 
 ////////////////////////// crypto rand ////////////////////////////////////////