diff --git a/src/ringct/bulletproofs.cc b/src/ringct/bulletproofs.cc
index 165691bfe..abe4ef18d 100644
--- a/src/ringct/bulletproofs.cc
+++ b/src/ringct/bulletproofs.cc
@@ -30,6 +30,7 @@
 
 #include <stdlib.h>
 #include <openssl/ssl.h>
+#include <openssl/bn.h>
 #include <boost/thread/mutex.hpp>
 #include "misc_log_ex.h"
 #include "common/perf_timer.h"