diff --git a/OpenRA.Mods.D2k/OpenRA.Mods.D2k.csproj b/OpenRA.Mods.D2k/OpenRA.Mods.D2k.csproj
index 7baf4c5cc0..50c76c26fc 100644
--- a/OpenRA.Mods.D2k/OpenRA.Mods.D2k.csproj
+++ b/OpenRA.Mods.D2k/OpenRA.Mods.D2k.csproj
@@ -39,12 +39,6 @@
     <PlatformTarget>x86</PlatformTarget>
     <ErrorReport>prompt</ErrorReport>
     <OutputPath>bin\Debug\</OutputPath>
-    <CustomCommands>
-      <CustomCommands>
-        <Command type="AfterBuild" command="cp ${TargetFile} ../mods/d2k" workingdir="${ProjectDir}" />
-        <Command type="AfterBuild" command="cp ${TargetFile}.mdb ../mods/d2k" workingdir="${ProjectDir}" />
-      </CustomCommands>
-    </CustomCommands>
     <DefineConstants>TRACE;DEBUG;</DefineConstants>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
@@ -59,12 +53,6 @@
     <ErrorReport>prompt</ErrorReport>
     <CodeAnalysisRuleSet>AllRules.ruleset</CodeAnalysisRuleSet>
     <Optimize>true</Optimize>
-    <CustomCommands>
-      <CustomCommands>
-        <Command type="AfterBuild" command="cp ${TargetFile} ../mods/d2k" workingdir="${ProjectDir}" />
-        <Command type="AfterBuild" command="cp ${TargetFile}.mdb ../mods/d2k" workingdir="${ProjectDir}" />
-      </CustomCommands>
-    </CustomCommands>
   </PropertyGroup>
   <ItemGroup>
     <Reference Include="System" />
@@ -101,7 +89,6 @@
     <Compile Include="Traits\World\D2kEditorResourceLayer.cs" />
     <Compile Include="Lint\CheckImportActors.cs" />
   </ItemGroup>
-  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <PropertyGroup>
     <PostBuildEvent>mkdir "$(SolutionDir)mods/d2k/"
 copy "$(TargetPath)" "$(SolutionDir)mods/d2k/"
@@ -136,6 +123,30 @@ cd "$(SolutionDir)"</PostBuildEvent>
       <Install>true</Install>
     </BootstrapperPackage>
   </ItemGroup>
-  <ItemGroup />
-  <ItemGroup />
-</Project>
\ No newline at end of file
+  <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
+  <Target Name="AfterBuild">
+    <MakeDir Directories="$(SolutionDir)mods/d2k/"/>
+    <Copy
+      SourceFiles="$(TargetPath)"
+      DestinationFolder="$(SolutionDir)mods/d2k/"/>
+    <!--
+        We need to copy OpenRA.Mods.D2k.pdb (not `.dll.pdb`). This is only necessary on Windows.
+        Mono outputs a `.dll.mdb` so we can just append `.mdb` directly.
+    -->
+    <Copy
+      SourceFiles="$(TargetDir)$(TargetName).pdb"
+      DestinationFolder="$(SolutionDir)mods/d2k/"
+      Condition="'$(OS)' == 'Windows_NT'"/>
+    <Copy
+      SourceFiles="$(TargetPath).mdb"
+      DestinationFolder="$(SolutionDir)mods/d2k/"
+      Condition="'$(OS)' == 'Unix'"/>
+    <!-- Uncomment these lines when debugging or adding to this target
+    <Message Text="DEBUG OS:                     $(OS)"/>
+    <Message Text="DEBUG SolutionDir:            $(SolutionDir)"/>
+    <Message Text="DEBUG TargetPath:             $(TargetPath)"/>
+    <Message Text="DEBUG TargetDir:              $(TargetDir)"/>
+    <Message Text="DEBUG TargetName:             $(TargetName)"/>
+    -->
+  </Target>
+</Project>