diff --git a/groups/mappingclassgroup.jl b/groups/mappingclassgroup.jl
index bb1005b..343f790 100644
--- a/groups/mappingclassgroup.jl
+++ b/groups/mappingclassgroup.jl
@@ -2,7 +2,7 @@ struct MappingClassGroup <: GAPGroup
     args::Dict{String,Any}
     N::Int
 
-    MappingClassGroup(args) = MappingClassGroup(args, args["MCG"])
+    MappingClassGroup(args) = new(args, args["MCG"])
 end
 
 name(G::MappingClassGroup) = "MCG($(G.N))"