diff --git a/Pythonnet.Runtime/Python.Runtime.csproj b/Pythonnet.Runtime/Python.Runtime.csproj
index ca785225b..fc01b7fd0 100644
--- a/Pythonnet.Runtime/Python.Runtime.csproj
+++ b/Pythonnet.Runtime/Python.Runtime.csproj
@@ -48,7 +48,7 @@
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x64' ">
     <DebugSymbols>true</DebugSymbols>
     <OutputPath>bin\x64\Debug\</OutputPath>
-    <DefineConstants>TRACE;DEBUG;PYTHON26,UCS2</DefineConstants>
+    <DefineConstants>TRACE;DEBUG;PYTHON27,UCS2</DefineConstants>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Optimize>true</Optimize>
     <DebugType>full</DebugType>
@@ -57,7 +57,7 @@
   </PropertyGroup>
   <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x64' ">
     <OutputPath>bin\x64\Release\</OutputPath>
-    <DefineConstants>TRACE;PYTHON26,UCS2</DefineConstants>
+    <DefineConstants>TRACE;PYTHON27,UCS2</DefineConstants>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
     <Optimize>true</Optimize>
     <DebugType>pdbonly</DebugType>