diff --git a/include/gssapi/gssapi.h b/include/gssapi/gssapi.h
index 84ba83ac09d9..94c63698b61c 100644
--- a/include/gssapi/gssapi.h
+++ b/include/gssapi/gssapi.h
@@ -89,6 +89,7 @@ typedef OM_object_identifier gss_OID_desc, *gss_OID;
  */
 
 typedef gss_uint32 OM_uint32;
+typedef uint64_t OM_uint64;
 
 typedef struct gss_OID_desc_struct {
   OM_uint32 length;