diff --git a/lib/rpc.ex b/lib/rpc.ex
index 13c3018..f976e32 100644
--- a/lib/rpc.ex
+++ b/lib/rpc.ex
@@ -64,12 +64,9 @@ defmodule Tezex.Rpc do
       Enum.map(preapplied_operations, fn content ->
         if validation_passes(content["kind"]) == 3 do
           internal_consumed_milligas =
-            Enum.reduce(content["metadata"]["internal_operation_results"], 0, fn obj, sum ->
-              sum +
-                case get_in(obj, ["result", "consumed_milligas"]) do
-                  nil -> 0
-                  n -> String.to_integer(n)
-                end
+            (get_in(content, ["metadata", "internal_operation_results"]) || [])
+            |> Enum.reduce(0, fn obj, sum ->
+              sum + String.to_integer(get_in(obj, ["result", "consumed_milligas"]) || "0")
             end)
 
           consumed_milligas =
diff --git a/test/rpc_test.exs b/test/rpc_test.exs
index 3983f47..154c08a 100644
--- a/test/rpc_test.exs
+++ b/test/rpc_test.exs
@@ -9,6 +9,7 @@ defmodule Tezex.RpcTest do
   @ghostnet_1_pkey "edsk33h91RysSBUiYyEWbeRwo41YeZrtMPTNsuZ9nzsYWwiV8CFyKi"
   @ghostnet_2_address "tz1cMcDFLgFe2picQbo4DY1i6mZJiVhPCu5B"
 
+  @tag :tezos
   test "get_counter_for_account" do
     counter =
       Rpc.get_counter_for_account(
@@ -467,6 +468,7 @@ defmodule Tezex.RpcTest do
     end
   end
 
+  @tag :tezos
   test "raise" do
     rpc = %Rpc{endpoint: @endpoint}