diff --git a/server/store/adapters/rdbms/drivers/dialect.go b/server/store/adapters/rdbms/drivers/dialect.go
index 681466470..f194b4052 100644
--- a/server/store/adapters/rdbms/drivers/dialect.go
+++ b/server/store/adapters/rdbms/drivers/dialect.go
@@ -192,5 +192,5 @@ func opHandlerIn(d Dialect, n *ql.ASTNode, negate bool, args ...exp.Expression)
 		return
 	}
 
-	return nil, fmt.Errorf("unsupported IN operator")
+	return nil, fmt.Errorf("unsupported IN operator on a single value field")
 }