--- ./sbuild/sbuild-util.cc.orig	2018-05-05 12:39:09.706894741 -0400
+++ ./sbuild/sbuild-util.cc	2018-05-05 12:41:46.963886076 -0400
@@ -631,7 +631,7 @@ sbuild::passwd::query_uid (uid_t uid)
   ::passwd *pwd_result;
 
   while ((error = getpwuid_r(uid, this,
-                             &buffer[0], buffer.capacity(),
+                             buffer.data(), buffer.capacity(),
                              &pwd_result)))
     {
       size <<= 1;
@@ -654,7 +654,7 @@ sbuild::passwd::query_name (const char *
   ::passwd *pwd_result;
 
   while ((error = getpwnam_r(name, this,
-                             &buffer[0], buffer.capacity(),
+                             buffer.data(), buffer.capacity(),
                              &pwd_result)))
     {
       size <<= 1;
@@ -740,7 +740,7 @@ sbuild::group::query_gid (gid_t gid)
   ::group *grp_result;
 
   while ((error = getgrgid_r(gid, this,
-                             &buffer[0], buffer.capacity(),
+                             buffer.data(), buffer.capacity(),
                              &grp_result)))
     {
       size <<= 1;
@@ -763,7 +763,7 @@ sbuild::group::query_name (const char *n
   ::group *grp_result;
 
   while ((error = getgrnam_r(name, this,
-                             &buffer[0], buffer.capacity(),
+                             buffer.data(), buffer.capacity(),
                              &grp_result)))
     {
       size <<= 1;