diff --git a/lang/ruby/rubyversion.mk b/lang/ruby/rubyversion.mk
index e94acd51d03e..a6a4f76b844e 100644
--- a/lang/ruby/rubyversion.mk
+++ b/lang/ruby/rubyversion.mk
@@ -1,4 +1,4 @@
-# $NetBSD: rubyversion.mk,v 1.250 2022/04/12 19:07:11 nia Exp $
+# $NetBSD: rubyversion.mk,v 1.251 2022/05/05 10:15:17 jperkin Exp $
 #
 
 # This file determines which Ruby version is used as a dependency for
@@ -618,6 +618,12 @@ RUBY?=			${PREFIX}/bin/${RUBY_NAME}
 RAKE?=			${PREFIX}/bin/${RAKE_NAME}
 RDOC?=			${PREFIX}/bin/rdoc${RUBY_SUFFIX}
 
+# ruby31 helpfully changed the config triple...
+.if !empty(MACHINE_PLATFORM:MDarwin-*-aarch64) && ${RUBY_VER} >= 31
+RUBY_ARCH?=	arm64-${LOWER_OPSYS}${APPEND_ELF}${LOWER_OPSYS_VERSUFFIX}${APPEND_ABI}
+RUBY_EXTARCH?=	arm64-${LOWER_OPSYS}${APPEND_ELF}-${LOWER_OPSYS_VERSUFFIX}
+.endif
+
 RUBY_ARCH?=	${MACHINE_GNU_ARCH}-${LOWER_OPSYS}${APPEND_ELF}${LOWER_OPSYS_VERSUFFIX}${APPEND_ABI}
 
 # NetBSD does not append an OS version, so we have to do this OPSYS-specific.