diff --git a/gap/structure.gi b/gap/structure.gi
index ff09ead..4b5e735 100644
--- a/gap/structure.gi
+++ b/gap/structure.gi
@@ -38,7 +38,7 @@ InstallMethod(GeneratorsOfMagma,
 );
 InstallMethod(GeneratorsOfMagma,
   "finite right quasigroups",
-  {IsRightQuasigroup and IsFinite],
+  [IsRightQuasigroup and IsFinite],
   q -> GeneratorsOfRightQuasigroup(q)
 );