diff --git a/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj b/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
index 7970f6265..09f5092f0 100644
--- a/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
+++ b/ICSharpCode.Decompiler.Tests/ICSharpCode.Decompiler.Tests.csproj
@@ -17,6 +17,7 @@
     <AllowUnsafeBlocks>True</AllowUnsafeBlocks>
 
     <NoWarn>1701;1702;1705,67,169,1058,728,1720,649,168,251,660,661,675;1998;162;8632;626;8618;8714;8602;8981</NoWarn>
+    <DefineConstants>ROSLYN;NET60;CS60;CS70;CS71;CS72;CS73;CS80;CS90;CS100;CS110;CS120</DefineConstants>
 
     <GenerateAssemblyVersionAttribute>False</GenerateAssemblyVersionAttribute>
     <GenerateAssemblyFileVersionAttribute>False</GenerateAssemblyFileVersionAttribute>
@@ -40,11 +41,11 @@
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
-    <DefineConstants>TRACE;DEBUG;ROSLYN;NET60;CS60;CS70;CS71;CS72;CS73;CS80;CS90;CS100</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;$(DefineConstants)</DefineConstants>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|AnyCPU'">
-    <DefineConstants>TRACE;ROSLYN;NET60;CS60;CS70;CS71;CS72;CS73;CS80;CS90;CS100</DefineConstants>
+    <DefineConstants>TRACE;$(DefineConstants)</DefineConstants>
   </PropertyGroup>
 
   <ItemGroup>