--- ceph-18.0.0-1810-g728e8ac0/src/osd/scrubber/scrub_backend.h.orig	2023-01-18 16:35:03.398700052 -0500
+++ ceph-18.0.0-1810-g728e8ac0/src/osd/scrubber/scrub_backend.h	2023-01-18 16:37:55.882677965 -0500
@@ -183,20 +183,20 @@
       // note: 'if' chain, as hard to consistently (on all compilers) avoid some
       // warnings for a switch plus multiple return paths
       if (as_auth.possible_auth == shard_as_auth_t::usable_t::not_usable) {
-        return format_to(ctx.out(),
-                         "{{shard-not-usable:{}}}",
-                         as_auth.error_text);
+        return fmt::format_to(ctx.out(),
+                              "{{shard-not-usable:{}}}",
+                              as_auth.error_text.c_str());
       }
       if (as_auth.possible_auth == shard_as_auth_t::usable_t::not_found) {
-        return format_to(ctx.out(), "{{shard-not-found}}");
+        return fmt::format_to(ctx.out(), "{{shard-not-found}}");
       }
-      return format_to(ctx.out(),
-                       "{{shard-usable: soid:{} {{txt:{}}} }}",
-                       as_auth.oi.soid,
-                       as_auth.error_text);
+      return fmt::format_to(ctx.out(),
+                            "{{shard-usable: soid:{} {{txt:{}}} }}",
+                            as_auth.oi.soid,
+                            as_auth.error_text.c_str());
 
     } else {
-      return format_to(
+      return fmt::format_to(
         ctx.out(),
         "usable:{} soid:{} {{txt:{}}}",
         (as_auth.possible_auth == shard_as_auth_t::usable_t::usable) ? "yes"