diff --git a/include/common/openssl-compat.h b/include/common/openssl-compat.h
index 5ac3aba..0ceca08 100644
--- a/include/common/openssl-compat.h
+++ b/include/common/openssl-compat.h
@@ -1,18 +1,27 @@
 #ifndef _COMMON_OPENSSL_COMPAT_H
 #define _COMMON_OPENSSL_COMPAT_H
+
+#include <openssl/bn.h>
 #include <openssl/crypto.h>
 #include <openssl/ssl.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
-#include <openssl/x509.h>
 #include <openssl/err.h>
 #include <openssl/rand.h>
+#include <openssl/hmac.h>
 #if (defined SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB && !defined OPENSSL_NO_OCSP)
 #include <openssl/ocsp.h>
 #endif
 #ifndef OPENSSL_NO_DH
 #include <openssl/dh.h>
 #endif
+#ifndef OPENSSL_NO_ENGINE
+#include <openssl/engine.h>
+#endif
+
+#if (OPENSSL_VERSION_NUMBER >= 0x1010000fL) && !defined(OPENSSL_NO_ASYNC) && !defined(LIBRESSL_VERSION_NUMBER)
+#include <openssl/async.h>
+#endif
 
 #if defined(LIBRESSL_VERSION_NUMBER)
 /* LibreSSL is a fork of OpenSSL 1.0.1g but pretends to be 2.0.0, thus
diff --git a/include/proto/ssl_sock.h b/include/proto/ssl_sock.h
index 9e27bfa..f3d3ff8 100644
--- a/include/proto/ssl_sock.h
+++ b/include/proto/ssl_sock.h
@@ -21,7 +21,7 @@
 
 #ifndef _PROTO_SSL_SOCK_H
 #define _PROTO_SSL_SOCK_H
-#include <openssl/ssl.h>
+#include <common/openssl-compat.h>
 
 #include <types/connection.h>
 #include <types/listener.h>
diff --git a/include/types/listener.h b/include/types/listener.h
index 7b4226f..def48b0 100644
--- a/include/types/listener.h
+++ b/include/types/listener.h
@@ -26,7 +26,7 @@
 #include <sys/socket.h>
 
 #ifdef USE_OPENSSL
-#include <openssl/ssl.h>
+#include <common/openssl-compat.h>
 #include <types/ssl_sock.h>
 #endif
 
diff --git a/include/types/server.h b/include/types/server.h
index dfc753e..2951cf6 100644
--- a/include/types/server.h
+++ b/include/types/server.h
@@ -26,7 +26,7 @@
 #include <arpa/inet.h>
 
 #ifdef USE_OPENSSL
-#include <openssl/ssl.h>
+#include <common/openssl-compat.h>
 #include <types/ssl_sock.h>
 #endif
 
diff --git a/include/types/ssl_sock.h b/include/types/ssl_sock.h
index 3de01e9..45f89c9 100644
--- a/include/types/ssl_sock.h
+++ b/include/types/ssl_sock.h
@@ -22,7 +22,6 @@
 #ifndef _TYPES_SSL_SOCK_H
 #define _TYPES_SSL_SOCK_H
 
-#include <openssl/ssl.h>
 #include <ebmbtree.h>
 
 #include <common/hathreads.h>