diff --git a/crypto777/nanosrc/nn.h b/crypto777/nanosrc/nn.h
index 3d6e7c598..0127338f3 100755
--- a/crypto777/nanosrc/nn.h
+++ b/crypto777/nanosrc/nn.h
@@ -30,6 +30,7 @@ extern "C" {
 
 #include <errno.h>
 #include <stddef.h>
+#include <stdint.h>
 #include "nn_config.h"
     
 /*  Handle DSO symbol visibility                                             */