diff --git a/gap/structure.gd b/gap/structure.gd
index 30941f6..781b207 100644
--- a/gap/structure.gd
+++ b/gap/structure.gd
@@ -44,7 +44,7 @@ DeclareSynonym("IsLeftRack", IsLeftQuasigroup and IsLSelfDistributive);
 DeclareSynonym("IsRightRack", IsRightQuasigroup and IsRSelfDistributive);
 
 DeclareSynonym("IsLeftQuandle", IsLeftRack and IsElementwiseIdempotent);
-DeclareSynonym("IsRightQuandle", IsLeftRack and IsElementwiseIdempotent);
+DeclareSynonym("IsRightQuandle", IsRightRack and IsElementwiseIdempotent);
 
 ## One-sided quasigroups and racks and quandles by generators