diff --git a/src/openvpn/ssl_openssl.c b/src/openvpn/ssl_openssl.c
index 527a600a..d9aec9bd 100644
--- a/src/openvpn/ssl_openssl.c
+++ b/src/openvpn/ssl_openssl.c
@@ -56,6 +56,15 @@
 #include <openssl/pkcs12.h>
 #include <openssl/x509.h>
 #include <openssl/crypto.h>
+#ifndef OPENSSL_NO_DH
+#include <openssl/dh.h>
+#endif
+#ifndef OPENSSL_NO_DSA
+#include <openssl/dsa.h>
+#endif
+#ifndef OPENSSL_NO_RSA
+#include <openssl/rsa.h>
+#endif
 #ifndef OPENSSL_NO_EC
 #include <openssl/ec.h>
 #endif
diff --git a/src/openvpn/ssl_verify_openssl.c b/src/openvpn/ssl_verify_openssl.c
index 9b984751..82460ae7 100644
--- a/src/openvpn/ssl_verify_openssl.c
+++ b/src/openvpn/ssl_verify_openssl.c
@@ -46,6 +46,7 @@
 
 #include <openssl/x509v3.h>
 #include <openssl/err.h>
+#include <openssl/bn.h>
 
 int
 verify_callback(int preverify_ok, X509_STORE_CTX *ctx)