diff --git a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
index 9a38c1172..fb1ff93a7 100644
--- a/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
+++ b/Assets/Mirror/CompilerSymbols/PreprocessorDefine.cs
@@ -39,7 +39,8 @@ public static void AddDefineSymbols()
                 "MIRROR_46_0_OR_NEWER",
                 "MIRROR_47_0_OR_NEWER",
                 "MIRROR_53_0_OR_NEWER",
-                "MIRROR_55_0_OR_NEWER"
+                "MIRROR_55_0_OR_NEWER",
+                "MIRROR_57_0_OR_NEWER"
             };
 
             // only touch PlayerSettings if we actually modified it.