diff --git a/include/libvirt/libvirt-admin.h b/include/libvirt/libvirt-admin.h
index feb94736459181a53c85fdfb65ce227a5209d76a..f83ac1c3585a90528131415630e1b68c95f71295 100644
--- a/include/libvirt/libvirt-admin.h
+++ b/include/libvirt/libvirt-admin.h
@@ -205,6 +205,16 @@ long long virAdmClientGetTimestamp(virAdmClientPtr client);
 int virAdmClientGetTransport(virAdmClientPtr client);
 int virAdmClientFree(virAdmClientPtr client);
 
+typedef enum {
+    VIR_CLIENT_TRANS_UNIX = 0, /* connection via UNIX socket */
+    VIR_CLIENT_TRANS_TCP,      /* connection via unencrypted TCP socket */
+    VIR_CLIENT_TRANS_TLS,      /* connection via encrypted TCP socket */
+
+# ifdef VIR_ENUM_SENTINELS
+    VIR_CLIENT_TRANS_LAST
+# endif
+} virClientTransport;
+
 # ifdef __cplusplus
 }
 # endif