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diff --git a/bin/1sh/tests/expansion/arith13.0 b/bin/1sh/tests/expansion/arith13.0
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+# $FreeBSD: releng/12.1/bin/sh/tests/expansion/arith13.0 254806 2013-08-24 20:06:00Z jilles $
+# Pre-increment and pre-decrement in arithmetic expansion are not in POSIX.
+# Require either an error or a correct implementation.
+
+! (eval 'x=4; [ $((++x)) != 5 ] || [ $x != 5 ]') 2>/dev/null &&
+! (eval 'x=2; [ $((--x)) != 1 ] || [ $x != 1 ]') 2>/dev/null