diff --git a/Pilz.IO/Pilz.IO.csproj b/Pilz.IO/Pilz.IO.csproj
index 176873d..519a863 100644
--- a/Pilz.IO/Pilz.IO.csproj
+++ b/Pilz.IO/Pilz.IO.csproj
@@ -24,6 +24,7 @@
     <OutputPath>bin\Debug\</OutputPath>
     <DocumentationFile>Pilz.IO.xml</DocumentationFile>
     <NoWarn>42016,41999,42017,42018,42019,42032,42036,42020,42021,42022,CS1591</NoWarn>
+    <DefineConstants>TRACE;DEBUG</DefineConstants>
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
     <DebugType>pdbonly</DebugType>