diff --git a/docker-compose.nix b/docker-compose.nix
index 032b7347b..d3d763ddf 100644
--- a/docker-compose.nix
+++ b/docker-compose.nix
@@ -4,7 +4,7 @@ let
   environment = ["COMPOSE_PROJECT_NAME"];
   redis_depend = {redis = {condition = "service_healthy";};};
   balance_verifier_level = level: {
-    command = "balance_verification --redis redis://redis:6379 --level ${level} --mock true";
+    command = "balance_verification --redis redis://redis:6379 --level ${builtins.toString level} --mock true";
     depends_on =
       {
         commitment_mapper = {condition = "service_started";};
@@ -13,19 +13,19 @@ let
       }
       // redis_depend
       // (
-        if (level != "0")
+        if (level > 0)
         then {
-          "balance_verifier_level_${level}" = {condition = "service_completed_successfully";};
+          "balance_verifier_level_${builtins.toString (level - 1)}" = {condition = "service_completed_successfully";};
         }
         else {}
       );
     entrypoint = "";
     inherit environment ports;
-    image = "balance-verifier-for-level-${level}";
+    image = "balance-verifier-for-level-${builtins.toString level}";
   };
-  allLevels = builtins.map builtins.toString [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37];
+  allLevels = [0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37];
   balance_verifier_all_levels = builtins.listToAttrs (builtins.map (level: {
-      name = "balance_verifier_level_${level}";
+      name = "balance_verifier_level_${builtins.toString level}";
       value = balance_verifier_level level;
     })
     allLevels);