diff --git a/osu.Game/osu.Game.csproj b/osu.Game/osu.Game.csproj
index 25b692151f..c669ac1981 100644
--- a/osu.Game/osu.Game.csproj
+++ b/osu.Game/osu.Game.csproj
@@ -176,6 +176,7 @@
     <Compile Include="Rulesets\Objects\Drawables\IDrawableHitObjectWithProxiedApproach.cs" />
     <Compile Include="Rulesets\Judgements\Judgement.cs" />
     <Compile Include="Rulesets\Objects\HitObjectParser.cs" />
+    <Compile Include="Rulesets\Objects\HitObjectStartTimeComparer.cs" />
     <Compile Include="Rulesets\Objects\Types\IHasCombo.cs" />
     <Compile Include="Rulesets\Objects\Types\IHasEndTime.cs" />
     <Compile Include="Rulesets\Objects\Types\IHasDistance.cs" />