diff --git a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
index 79775a7bd..baf079ea9 100644
--- a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
+++ b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
@@ -22,14 +22,14 @@ public static void AddDefineSymbols()
             HashSet<string> defines = new HashSet<string>(currentDefines.Split(';'))
             {
                 "MIRROR",
-                "MIRROR_79_OR_NEWER",
                 "MIRROR_81_OR_NEWER",
                 "MIRROR_82_OR_NEWER",
                 "MIRROR_83_OR_NEWER",
                 "MIRROR_84_OR_NEWER",
                 "MIRROR_85_OR_NEWER",
                 "MIRROR_86_OR_NEWER",
-                "MIRROR_89_OR_NEWER"
+                "MIRROR_89_OR_NEWER",
+                "MIRROR_90_OR_NEWER"
             };
 
             // only touch PlayerSettings if we actually modified it,