diff --git a/ricaun.Revit.UI/ricaun.Revit.UI.csproj b/ricaun.Revit.UI/ricaun.Revit.UI.csproj
index b7b5e86..dd0fdd5 100644
--- a/ricaun.Revit.UI/ricaun.Revit.UI.csproj
+++ b/ricaun.Revit.UI/ricaun.Revit.UI.csproj
@@ -42,7 +42,7 @@
   <PropertyGroup Condition="!$(Configuration.Contains('Debug'))">
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>Revit$(RevitVersion)</DefineConstants>
+    <DefineConstants>REVIT$(RevitVersion)</DefineConstants>
     <NoWarn>MSB3052</NoWarn>
     <DebugType>None</DebugType>
   </PropertyGroup>
@@ -51,7 +51,7 @@
   <PropertyGroup Condition="$(Configuration.Contains('Debug'))">
     <DebugSymbols>true</DebugSymbols>
     <OutputPath>bin\Debug\</OutputPath>
-    <DefineConstants>DEBUG;TRACE;Revit$(RevitVersion)</DefineConstants>
+    <DefineConstants>DEBUG;TRACE;REVIT$(RevitVersion)</DefineConstants>
     <DebugType>Full</DebugType>
   </PropertyGroup>