diff --git a/src/crypto/aes.cpp b/src/crypto/aes.cpp
index 41fd35f..b115805 100644
--- a/src/crypto/aes.cpp
+++ b/src/crypto/aes.cpp
@@ -7,6 +7,8 @@
 #include <fc/io/raw.hpp>
 
 #include <fc/log/logger.hpp>
+
+#include <fc/thread/thread.hpp>
 #include <boost/thread/mutex.hpp>
 #include <openssl/opensslconf.h>
 #ifndef OPENSSL_THREADS