diff --git a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
index 0f73ce70c..b553d40fc 100644
--- a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
+++ b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
@@ -25,7 +25,8 @@ public static void AddDefineSymbols()
                 "MIRROR_71_0_OR_NEWER",
                 "MIRROR_73_OR_NEWER",
                 "MIRROR_78_OR_NEWER",
-                "MIRROR_79_OR_NEWER"
+                "MIRROR_79_OR_NEWER",
+                "MIRROR_81_OR_NEWER"
                 // Remove oldest when adding next month's symbol.
                 // Keep a rolling 12 months of symbols.
             };
diff --git a/ProjectSettings/ProjectSettings.asset b/ProjectSettings/ProjectSettings.asset
index 0262cd848..be2e5e4ef 100644
--- a/ProjectSettings/ProjectSettings.asset
+++ b/ProjectSettings/ProjectSettings.asset
@@ -580,7 +580,7 @@ PlayerSettings:
   webGLPowerPreference: 2
   scriptingDefineSymbols:
     Server: MIRROR;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER
-    Standalone: MIRROR;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER;MIRROR_78_OR_NEWER;MIRROR_79_OR_NEWER
+    Standalone: MIRROR;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER;MIRROR_78_OR_NEWER;MIRROR_79_OR_NEWER;MIRROR_81_OR_NEWER
     WebGL: MIRROR;MIRROR_57_0_OR_NEWER;MIRROR_58_0_OR_NEWER;MIRROR_65_0_OR_NEWER;MIRROR_66_0_OR_NEWER;MIRROR_2022_9_OR_NEWER;MIRROR_2022_10_OR_NEWER;MIRROR_70_0_OR_NEWER;MIRROR_71_0_OR_NEWER;MIRROR_73_OR_NEWER
   additionalCompilerArguments: {}
   platformArchitecture: {}