diff --git a/Facepunch.Steamworks/Facepunch.Steamworks.Posix32.csproj b/Facepunch.Steamworks/Facepunch.Steamworks.Posix32.csproj
index 67e2033..e0ef778 100644
--- a/Facepunch.Steamworks/Facepunch.Steamworks.Posix32.csproj
+++ b/Facepunch.Steamworks/Facepunch.Steamworks.Posix32.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<AssemblyName>Facepunch.Steamworks.Posix32</AssemblyName>
-		<DefineConstants>$(DefineConstants);PLATFORM_POSIX32;PLATFORM_POSIX</DefineConstants>
+		<DefineConstants>$(DefineConstants);PLATFORM_POSIX32;PLATFORM_POSIX;PLATFORM_32</DefineConstants>
 		<TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 		<LangVersion>7.1</LangVersion>	
diff --git a/Facepunch.Steamworks/Facepunch.Steamworks.Posix64.csproj b/Facepunch.Steamworks/Facepunch.Steamworks.Posix64.csproj
index f993377..df8fd32 100644
--- a/Facepunch.Steamworks/Facepunch.Steamworks.Posix64.csproj
+++ b/Facepunch.Steamworks/Facepunch.Steamworks.Posix64.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<AssemblyName>Facepunch.Steamworks.Posix64</AssemblyName>
-		<DefineConstants>$(DefineConstants);PLATFORM_POSIX64;PLATFORM_POSIX</DefineConstants>
+		<DefineConstants>$(DefineConstants);PLATFORM_POSIX64;PLATFORM_POSIX;PLATFORM_64</DefineConstants>
 		<TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 		<LangVersion>7.1</LangVersion>	
diff --git a/Facepunch.Steamworks/Facepunch.Steamworks.Win32.csproj b/Facepunch.Steamworks/Facepunch.Steamworks.Win32.csproj
index 3e00781..ce68aa0 100644
--- a/Facepunch.Steamworks/Facepunch.Steamworks.Win32.csproj
+++ b/Facepunch.Steamworks/Facepunch.Steamworks.Win32.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<AssemblyName>Facepunch.Steamworks.Win32</AssemblyName>
-		<DefineConstants>$(DefineConstants);PLATFORM_WIN32;PLATFORM_WIN</DefineConstants>
+		<DefineConstants>$(DefineConstants);PLATFORM_WIN32;PLATFORM_WIN;PLATFORM_32</DefineConstants>
 		<TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 		<LangVersion>7.1</LangVersion>	
diff --git a/Facepunch.Steamworks/Facepunch.Steamworks.Win64.csproj b/Facepunch.Steamworks/Facepunch.Steamworks.Win64.csproj
index 69d24e6..40bdd37 100644
--- a/Facepunch.Steamworks/Facepunch.Steamworks.Win64.csproj
+++ b/Facepunch.Steamworks/Facepunch.Steamworks.Win64.csproj
@@ -2,7 +2,7 @@
 
 	<PropertyGroup>
 		<AssemblyName>Facepunch.Steamworks.Win64</AssemblyName>
-		<DefineConstants>$(DefineConstants);PLATFORM_WIN64;PLATFORM_WIN</DefineConstants>
+		<DefineConstants>$(DefineConstants);PLATFORM_WIN64;PLATFORM_WIN;PLATFORM_64</DefineConstants>
 		<TargetFrameworks>netstandard2.0;net46</TargetFrameworks>
 		<AllowUnsafeBlocks>true</AllowUnsafeBlocks>
 		<LangVersion>7.1</LangVersion>