diff --git a/nixos/modules/image/repart.nix b/nixos/modules/image/repart.nix
index 9e7fe6932b3..4362982f5ba 100644
--- a/nixos/modules/image/repart.nix
+++ b/nixos/modules/image/repart.nix
@@ -195,7 +195,9 @@ in
           --seed="${cfg.seed}" \
           --definitions="$amendedRepartDefinitions" \
           --split="${lib.boolToString cfg.split}" \
-          image.raw
+          --json=pretty \
+          image.raw \
+          | tee repart-output.json
       '';
 
     meta = {