diff --git a/lib/explorer/ethereumex_extensions.ex b/lib/explorer/ethereumex_extensions.ex
index d4d1502586..7f80869f8b 100644
--- a/lib/explorer/ethereumex_extensions.ex
+++ b/lib/explorer/ethereumex_extensions.ex
@@ -5,6 +5,7 @@ defmodule Explorer.EthereumexExtensions do
 
   alias Ethereumex.HttpClient
 
+  @dialyzer {:nowarn_function, trace_transaction: 1}
   def trace_transaction(hash) do
     params = [hash, ["trace"]]
     {:ok, trace} = HttpClient.request("trace_replayTransaction", params, [])
diff --git a/lib/explorer/importers/internal_transaction_importer.ex b/lib/explorer/importers/internal_transaction_importer.ex
index 788ea9815f..8f3b0f9b2f 100644
--- a/lib/explorer/importers/internal_transaction_importer.ex
+++ b/lib/explorer/importers/internal_transaction_importer.ex
@@ -9,6 +9,7 @@ defmodule Explorer.InternalTransactionImporter do
   alias Explorer.Repo
   alias Explorer.Transaction
 
+  @dialyzer {:nowarn_function, import: 1}
   def import(hash) do
     transaction = find_transaction(hash)
     hash
@@ -17,6 +18,7 @@ defmodule Explorer.InternalTransactionImporter do
     |> persist_internal_transactions(transaction)
   end
 
+  @dialyzer {:nowarn_function, download_trace: 1}
   defp download_trace(hash) do
     EthereumexExtensions.trace_transaction(hash)
   end
@@ -28,6 +30,7 @@ defmodule Explorer.InternalTransactionImporter do
     Repo.one!(query)
   end
 
+  @dialyzer {:nowarn_function, extract_attrs: 1}
   defp extract_attrs(attrs) do
     trace = attrs["trace"]
     trace |> Enum.with_index() |> Enum.map(&extract_trace/1)
@@ -55,6 +58,7 @@ defmodule Explorer.InternalTransactionImporter do
 
   defp from_address(%{"action" => %{"from" => address}}), do: address
 
+  @dialyzer {:nowarn_function, persist_internal_transactions: 2}
   defp persist_internal_transactions(traces, transaction) do
     Enum.map(traces, fn(trace) ->
       trace = Map.merge(trace, %{transaction_id: transaction.id})