diff --git a/gap/bytable.gi b/gap/bytable.gi
index 81bda85..a1fb785 100644
--- a/gap/bytable.gi
+++ b/gap/bytable.gi
@@ -198,12 +198,12 @@ end);
 
 ## Distributivity/idempotence checkers for when need be
 InstallMethod(IsLSelfDistributive, "for collections with multiplication tables",
-              [HasMultiplicationTable],
+              [IsMultiplicativeElementCollection and HasMultiplicationTable],
               M -> IsLeftSelfDistributiveTable(MultiplicationTable(M))
 );
 
 InstallMethod(IsRSelfDistributive, "for collections with multiplication table",
-              [HasMultiplicationTable],
+              [IsMultiplicativeElementCollection and HasMultiplicationTable],
               M -> IsRightSelfDistributiveTable(MultiplicationTable(M))
 );