diff --git a/src/StardewModdingAPI/StardewModdingAPI.csproj b/src/StardewModdingAPI/StardewModdingAPI.csproj
index ee03aea2..6691b2b5 100644
--- a/src/StardewModdingAPI/StardewModdingAPI.csproj
+++ b/src/StardewModdingAPI/StardewModdingAPI.csproj
@@ -261,34 +261,4 @@
   </ItemGroup>
   <Import Project="$(SolutionDir)\common.targets" />
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
-  <PropertyGroup>
-    <PostBuildEvent>
-    </PostBuildEvent>
-  </PropertyGroup>
-  <!-- if game path is invalid, show one user-friendly error instead of a slew of reference errors -->
-  <Target Name="BeforeBuild">
-    <Error Condition="!Exists('$(GamePath)')" Text="Failed to find the game install path automatically; edit the *.csproj file and manually add a &lt;GamePath&gt; setting with the full directory path containing the Stardew Valley executable." />
-  </Target>
-
-  <!-- copy files into game directory and enable debugging (only in debug mode) -->
-  <Target Name="AfterBuild" Condition="$(Configuration) == 'Debug'">
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).exe" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).config.json" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\StardewModdingAPI.AssemblyRewriters.dll" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).pdb" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).xml" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\Newtonsoft.Json.dll" DestinationFolder="$(GamePath)" />
-    <Copy SourceFiles="$(TargetDir)\Mono.Cecil.dll" DestinationFolder="$(GamePath)" />
-  </Target>
-
-  <!-- launch SMAPI on debug -->
-  <PropertyGroup Condition="$(Configuration) == 'Debug'">
-    <StartAction>Program</StartAction>
-    <StartProgram>$(GamePath)\StardewModdingAPI.exe</StartProgram>
-    <StartWorkingDirectory>$(GamePath)</StartWorkingDirectory>
-  </PropertyGroup>
-
-  <!-- Somehow this makes Visual Studio for Mac recognise the previous section. -->
-  <!-- Nobody knows why. -->
-  <PropertyGroup Condition="'$(RunConfiguration)' == 'Default'" />
 </Project>
\ No newline at end of file
diff --git a/src/TrainerMod/TrainerMod.csproj b/src/TrainerMod/TrainerMod.csproj
index 03b25f8b..73b40050 100644
--- a/src/TrainerMod/TrainerMod.csproj
+++ b/src/TrainerMod/TrainerMod.csproj
@@ -101,9 +101,4 @@
   </ItemGroup>
   <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
   <Import Project="$(SolutionDir)\common.targets" />
-  <Target Name="AfterBuild" Condition="$(Configuration) == 'Debug'">
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).dll" DestinationFolder="$(GamePath)\Mods\TrainerMod" />
-    <Copy SourceFiles="$(TargetDir)\$(TargetName).pdb" DestinationFolder="$(GamePath)\Mods\TrainerMod" Condition="Exists('$(TargetDir)\$(TargetName).pdb')" />
-    <Copy SourceFiles="$(TargetDir)\manifest.json" DestinationFolder="$(GamePath)\Mods\TrainerMod" />
-  </Target>
 </Project>
\ No newline at end of file
diff --git a/src/common.targets b/src/common.targets
index f320cd9a..81e7e2a5 100644
--- a/src/common.targets
+++ b/src/common.targets
@@ -70,4 +70,36 @@
       </ItemGroup>
     </Otherwise>
   </Choose>
+
+  <!-- if game path is invalid, show one user-friendly error instead of a slew of reference errors -->
+  <Target Name="BeforeBuild">
+    <Error Condition="!Exists('$(GamePath)')" Text="Failed to find the game install path automatically; edit the *.csproj file and manually add a &lt;GamePath&gt; setting with the full directory path containing the Stardew Valley executable." />
+  </Target>
+
+  <!-- copy files into game directory and enable debugging (only in debug mode) -->
+  <Target Name="AfterBuild" Condition="'$(MSBuildProjectName)' == 'StardewModdingAPI' AND '$(Configuration)' == 'Debug'">
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).exe" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).config.json" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\StardewModdingAPI.AssemblyRewriters.dll" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).pdb" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).xml" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\Newtonsoft.Json.dll" DestinationFolder="$(GamePath)" />
+    <Copy SourceFiles="$(TargetDir)\Mono.Cecil.dll" DestinationFolder="$(GamePath)" />
+  </Target>
+  <Target Name="AfterBuild" Condition="'$(MSBuildProjectName)' == 'TrainerMod' AND '$(Configuration)' == 'Debug'">
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).dll" DestinationFolder="$(GamePath)\Mods\TrainerMod" />
+    <Copy SourceFiles="$(TargetDir)\$(TargetName).pdb" DestinationFolder="$(GamePath)\Mods\TrainerMod" Condition="Exists('$(TargetDir)\$(TargetName).pdb')" />
+    <Copy SourceFiles="$(TargetDir)\manifest.json" DestinationFolder="$(GamePath)\Mods\TrainerMod" />
+  </Target>
+
+  <!-- launch SMAPI on debug -->
+  <PropertyGroup Condition="$(Configuration) == 'Debug'">
+    <StartAction>Program</StartAction>
+    <StartProgram>$(GamePath)\StardewModdingAPI.exe</StartProgram>
+    <StartWorkingDirectory>$(GamePath)</StartWorkingDirectory>
+  </PropertyGroup>
+
+  <!-- Somehow this makes Visual Studio for Mac recognise the previous section. Nobody knows why. -->
+  <PropertyGroup Condition="'$(RunConfiguration)' == 'Default'" />
+
 </Project>
\ No newline at end of file