diff --git a/src/Servers/HttpSys/HttpSysServer.slnf b/src/Servers/HttpSys/HttpSysServer.slnf
index f8072017e440..492b2dfc1077 100644
--- a/src/Servers/HttpSys/HttpSysServer.slnf
+++ b/src/Servers/HttpSys/HttpSysServer.slnf
@@ -2,6 +2,7 @@
   "solution": {
     "path": "..\\..\\..\\AspNetCore.sln",
     "projects": [
+      "src\\Antiforgery\\src\\Microsoft.AspNetCore.Antiforgery.csproj",
       "src\\DataProtection\\Abstractions\\src\\Microsoft.AspNetCore.DataProtection.Abstractions.csproj",
       "src\\DataProtection\\Cryptography.Internal\\src\\Microsoft.AspNetCore.Cryptography.Internal.csproj",
       "src\\DataProtection\\DataProtection\\src\\Microsoft.AspNetCore.DataProtection.csproj",