diff --git a/changes/17167.md b/changes/17167.md
new file mode 100644
index 000000000000..4e9a95b21ee7
--- /dev/null
+++ b/changes/17167.md
@@ -0,0 +1 @@
+Do not use pretty print of replayer checkpoints and output file in order to avoid stack overflow issue when replaying mainnet
\ No newline at end of file
diff --git a/src/app/replayer/replayer.ml b/src/app/replayer/replayer.ml
index 0c9bd98240e3..e32f2955b7a9 100644
--- a/src/app/replayer/replayer.ml
+++ b/src/app/replayer/replayer.ml
@@ -604,7 +604,7 @@ let write_replayer_checkpoint ~logger ~ledger ~last_global_slot_since_genesis
       let%map input =
         create_replayer_checkpoint ~ledger ~start_slot_since_genesis
       in
-      input_to_yojson input |> Yojson.Safe.pretty_to_string
+      input_to_yojson input
     in
     let checkpoint_file =
       let checkpoint_filename =
@@ -620,7 +620,7 @@ let write_replayer_checkpoint ~logger ~ledger ~last_global_slot_since_genesis
     [%log info] "Writing checkpoint file"
       ~metadata:[ ("checkpoint_file", `String checkpoint_file) ] ;
     Out_channel.with_file checkpoint_file ~f:(fun oc ->
-        Out_channel.output_string oc replayer_checkpoint ) )
+        Yojson.Safe.to_channel oc replayer_checkpoint ) )
   else (
     [%log info] "Not writing checkpoint file at slot %Ld, because not canonical"
       last_global_slot_since_genesis
@@ -1681,11 +1681,11 @@ let main ~input_file ~output_file_opt ~archive_uri ~continue_on_error
                       ~next_epoch_ledger:!next_epoch_ledger
                       ~next_seed:!next_seed input.genesis_ledger
                   in
-                  output_to_yojson output |> Yojson.Safe.pretty_to_string
+                  output_to_yojson output
                 in
                 return
                 @@ Out_channel.with_file output_file ~f:(fun oc ->
-                       Out_channel.output_string oc output ) )
+                       Yojson.Safe.to_channel oc output ) )
               else (
                 [%log error] "There were %d errors, not writing output"
                   !error_count ;