diff --git a/usr.bin/uniq/tests/uniq_test.sh b/usr.bin/uniq/tests/uniq_test.sh
--- a/usr.bin/uniq/tests/uniq_test.sh
+++ b/usr.bin/uniq/tests/uniq_test.sh
@@ -167,6 +167,8 @@
 stdout_body() {
 	(
 		trap "" PIPE
+		# Give true(1) some time to exit.
+		sleep 1
 		echo a | uniq 2>stderr
 		echo $? >result
 	) | true