diff --git a/lib/MessageCrypto.h b/lib/MessageCrypto.h
index 4052066d..71c2eaa0 100644
--- a/lib/MessageCrypto.h
+++ b/lib/MessageCrypto.h
@@ -20,7 +20,6 @@
 #define LIB_MESSAGECRYPTO_H_
 
 #include <openssl/bio.h>
-#include <openssl/engine.h>
 #include <openssl/evp.h>
 #include <openssl/rand.h>
 #include <openssl/rsa.h>