diff --git a/Alpaca.Markets/Parameters/AccountActivitiesRequest.cs b/Alpaca.Markets/Parameters/AccountActivitiesRequest.cs
index 569e5b75..20c3251f 100644
--- a/Alpaca.Markets/Parameters/AccountActivitiesRequest.cs
+++ b/Alpaca.Markets/Parameters/AccountActivitiesRequest.cs
@@ -87,13 +87,13 @@ internal async ValueTask<UriBuilder> GetUriBuilderAsync(
         {
             Path = "v2/account/activities",
             Query = await new QueryBuilder()
-                .AddParameter("activity_types", ActivityTypes)
+                .AddParameter("activity_type", ActivityTypes)
                 .AddParameter("date", Date)
                 .AddParameter("until", TimeInterval.Into, "O")
                 .AddParameter("after", TimeInterval.From, "O")
                 .AddParameter("direction", Direction)
-                .AddParameter("pageSize", PageSize)
-                .AddParameter("pageToken", PageToken)
+                .AddParameter("page_size", PageSize)
+                .AddParameter("page_token", PageToken)
                 .AsStringAsync().ConfigureAwait(false)
         };