diff --git a/apps/opentelemetry_experimental/src/otel_metric_reader.erl b/apps/opentelemetry_experimental/src/otel_metric_reader.erl
index 7f853e4c..598aca70 100644
--- a/apps/opentelemetry_experimental/src/otel_metric_reader.erl
+++ b/apps/opentelemetry_experimental/src/otel_metric_reader.erl
@@ -49,7 +49,7 @@
          metrics_tab :: ets:tid()
         }).
 
--spec start_monitor(module(), otel_configuration:t()) -> {ok, {pid(), reference()}} | ignore | {error, term()}.
+-spec start_monitor(module(), map()) -> {ok, {pid(), reference()}} | ignore | {error, term()}.
 start_monitor(ReaderModule, Config) ->
     gen_server:start_monitor(ReaderModule, Config, []).