diff --git a/osu.Server.Queues.ScoreStatisticsProcessor/Helpers/LegacyDatabaseHelper.cs b/osu.Server.Queues.ScoreStatisticsProcessor/Helpers/LegacyDatabaseHelper.cs
index 6a2fc203..b111e688 100644
--- a/osu.Server.Queues.ScoreStatisticsProcessor/Helpers/LegacyDatabaseHelper.cs
+++ b/osu.Server.Queues.ScoreStatisticsProcessor/Helpers/LegacyDatabaseHelper.cs
@@ -2,6 +2,7 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Net;
 using System.Net.Http;
@@ -120,7 +121,10 @@ public static HttpResponseMessage RunLegacyIO(string command, string method = "G
                 {
                     case string postString:
                         httpRequestMessage.Content = new StringContent(postString);
-                        httpRequestMessage.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("plain/text");
+                        break;
+
+                    case IEnumerable<KeyValuePair<string, string>> formKeyValuePairs:
+                        httpRequestMessage.Content = new FormUrlEncodedContent(formKeyValuePairs);
                         break;
 
                     default:
diff --git a/osu.Server.Queues.ScoreStatisticsProcessor/Processors/PlayCountProcessor.cs b/osu.Server.Queues.ScoreStatisticsProcessor/Processors/PlayCountProcessor.cs
index 5e37c720..09fbf4ee 100644
--- a/osu.Server.Queues.ScoreStatisticsProcessor/Processors/PlayCountProcessor.cs
+++ b/osu.Server.Queues.ScoreStatisticsProcessor/Processors/PlayCountProcessor.cs
@@ -2,7 +2,9 @@
 // See the LICENCE file in the repository root for full licence text.
 
 using System;
+using System.Collections.Generic;
 using System.Diagnostics;
+using System.Globalization;
 using Dapper;
 using JetBrains.Annotations;
 using MySqlConnector;
@@ -112,7 +114,7 @@ private static void adjustGlobalBeatmapPlaycount(SoloScore score, MySqlConnectio
 
                 // Reindex beatmap occasionally.
                 if (RNG.Next(0, 10) == 0)
-                    LegacyDatabaseHelper.RunLegacyIO("indexing/bulk", "POST", $"beatmapset[]={score.beatmap.beatmapset_id}");
+                    LegacyDatabaseHelper.RunLegacyIO("indexing/bulk", "POST", new[] { new KeyValuePair<string, string>("beatmapset[]", score.beatmap.beatmapset_id.ToString(CultureInfo.InvariantCulture)) });
 
                 // TODO: announce playcount milestones
                 // const int notify_amount = 1000000;