--- a/src/gssl/gssl_openssl.cpp
+++ b/src/gssl/gssl_openssl.cpp
@@ -32,7 +32,6 @@
 #include <openssl/ssl.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
-#include <openssl/engine.h>
 #include <openssl/conf.h>
 #include <openssl/evp.h>
 #include <openssl/hmac.h>
