diff --git a/libcli/smb/smb2_signing.c b/libcli/smb/smb2_signing.c
index 7b33a42526e..623fc23fb18 100644
--- a/libcli/smb/smb2_signing.c
+++ b/libcli/smb/smb2_signing.c
@@ -20,6 +20,9 @@
 
 #include "includes.h"
 #include "system/filesys.h"
+#include <gnutls/gnutls.h>
+#include <gnutls/crypto.h>
+#define SMB2_SIGNING_KEY_GNUTLS_TYPES 1
 #include "../libcli/smb/smb_common.h"
 #include "../lib/crypto/crypto.h"
 #include "lib/util/iov_buf.h"
@@ -30,8 +33,6 @@
 #endif
 
 #include "lib/crypto/gnutls_helpers.h"
-#include <gnutls/gnutls.h>
-#include <gnutls/crypto.h>
 
 int smb2_signing_key_destructor(struct smb2_signing_key *key)
 {
diff --git a/libcli/smb/smb2_signing.h b/libcli/smb/smb2_signing.h
index e28b5c8de9a..ca22de9dbfa 100644
--- a/libcli/smb/smb2_signing.h
+++ b/libcli/smb/smb2_signing.h
@@ -22,16 +22,21 @@
 #define _LIBCLI_SMB_SMB2_SIGNING_H_
 
 struct iovec;
- /* Forward declaration of GnuTLS typedefs */
-struct hmac_hd_st;
-typedef struct hmac_hd_st* gnutls_hmac_hd_t;
-struct  api_aead_cipher_hd_st;
-typedef struct api_aead_cipher_hd_st *gnutls_aead_cipher_hd_t;
 
 struct smb2_signing_key {
-	gnutls_hmac_hd_t hmac_hnd;
-	gnutls_aead_cipher_hd_t cipher_hnd;
 	DATA_BLOB blob;
+	union {
+#ifdef SMB2_SIGNING_KEY_GNUTLS_TYPES
+		gnutls_hmac_hd_t hmac_hnd;
+#endif
+		void *__hmac_hnd;
+	};
+	union {
+#ifdef SMB2_SIGNING_KEY_GNUTLS_TYPES
+		gnutls_aead_cipher_hd_t cipher_hnd;
+#endif
+		void *__cipher_hnd;
+	};
 };
 
 int smb2_signing_key_destructor(struct smb2_signing_key *key);