diff --git a/src/tests/test-stream.c b/src/tests/test-stream.c
index c0ba9dc90..d56b6c85b 100644
--- a/src/tests/test-stream.c
+++ b/src/tests/test-stream.c
@@ -47,7 +47,7 @@ static void test_abi(void)
 	TEST_FUNC(ev, test, trigger_done);
 
 #if defined(__x86_64__) && defined(__LP64__)
-	spa_assert_se(sizeof(struct pw_buffer) == 32);
+	spa_assert_se(sizeof(struct pw_buffer) == 40);
 	spa_assert_se(sizeof(struct pw_time) == 64);
 #else
 	fprintf(stderr, "%zd\n", sizeof(struct pw_buffer));