diff --git a/src/NmeaParser/NmeaParser.csproj b/src/NmeaParser/NmeaParser.csproj
index cf5c4ea..298481b 100644
--- a/src/NmeaParser/NmeaParser.csproj
+++ b/src/NmeaParser/NmeaParser.csproj
@@ -51,6 +51,9 @@
   <PropertyGroup Condition="'$(TargetFramework)' == 'net6.0'">
     <DefineConstants>$(DefineConstants);NETSTANDARD</DefineConstants>
   </PropertyGroup>
+  <PropertyGroup Condition="$([MSBuild]::GetTargetPlatformIdentifier('$(TargetFramework)')) == 'windows'">
+    <DefineConstants>$(DefineConstants);WINDOWS</DefineConstants>
+  </PropertyGroup>
 
   <PropertyGroup Condition="'$(TargetFramework)' == 'net452'">
     <DefineConstants>$(DefineConstants);NETFX</DefineConstants>