diff --git a/src/dmd/astbase.d b/src/dmd/astbase.d
index 2f57a2b5dd1e..15803ef3981d 100644
--- a/src/dmd/astbase.d
+++ b/src/dmd/astbase.d
@@ -4162,7 +4162,6 @@ struct ASTBase
     {
         TraitsExp exp;
         Loc loc;
-        bool inAliasDeclaration;
 
         extern (D) this(const ref Loc loc, TraitsExp exp)
         {