diff --git a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
index 58c3c28710..475955e31a 100644
--- a/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
+++ b/OpenRA.Mods.Common/OpenRA.Mods.Common.csproj
@@ -172,6 +172,7 @@
     <Compile Include="Traits\Sound\AnnounceOnKill.cs" />
     <Compile Include="Traits\Sound\DeathSounds.cs" />
     <Compile Include="Traits\Sound\SoundOnDamageTransition.cs" />
+    <Compile Include="Traits\Tooltip.cs" />
     <Compile Include="Traits\Upgrades\UpgradableTrait.cs" />
     <Compile Include="Traits\Upgrades\UpgradeManager.cs" />
     <Compile Include="Traits\Valued.cs" />
diff --git a/OpenRA.Mods.RA/Tooltip.cs b/OpenRA.Mods.Common/Traits/Tooltip.cs
similarity index 98%
rename from OpenRA.Mods.RA/Tooltip.cs
rename to OpenRA.Mods.Common/Traits/Tooltip.cs
index 524502e817..b85ee43a7b 100644
--- a/OpenRA.Mods.RA/Tooltip.cs
+++ b/OpenRA.Mods.Common/Traits/Tooltip.cs
@@ -10,7 +10,7 @@
 
 using OpenRA.Traits;
 
-namespace OpenRA.Mods.RA
+namespace OpenRA.Mods.Common.Traits
 {
 	[Desc("Shown in the build palette widget.")]
 	public class TooltipInfo : ITraitInfo, ITooltipInfo
diff --git a/OpenRA.Mods.RA/OpenRA.Mods.RA.csproj b/OpenRA.Mods.RA/OpenRA.Mods.RA.csproj
index 1112c60346..7a3a55c6f1 100644
--- a/OpenRA.Mods.RA/OpenRA.Mods.RA.csproj
+++ b/OpenRA.Mods.RA/OpenRA.Mods.RA.csproj
@@ -344,7 +344,6 @@
     <Compile Include="Widgets\Logic\WorldTooltipLogic.cs" />
     <Compile Include="Buildings\Bib.cs" />
     <Compile Include="Render\WithIdleOverlay.cs" />
-    <Compile Include="Tooltip.cs" />
     <Compile Include="AI\Squad.cs" />
     <Compile Include="AI\States\StateBase.cs" />
     <Compile Include="AI\States\GroundStates.cs" />