diff -r 267db8c321c4 -r 328de89f20f9 src/HOL/Rings.thy
--- a/src/HOL/Rings.thy	Fri May 02 17:24:43 2025 +0200
+++ b/src/HOL/Rings.thy	Sun May 04 12:18:27 2025 +0100
@@ -1987,6 +1987,8 @@
 
 subclass ordered_semiring_0 ..
 
+subclass ordered_cancel_ab_semigroup_add ..
+
 end
 
 class linordered_semiring = ordered_semiring + linordered_cancel_ab_semigroup_add