diff --git a/tests/uio.c b/tests/uio.c
index aac123a6..fc5eae3d 100644
--- a/tests/uio.c
+++ b/tests/uio.c
@@ -11,19 +11,19 @@ main(void)
 {
 #if defined(HAVE_PREADV) && defined(HAVE_PWRITEV)
 	const off_t offset = 0xdefaceddeadbeefLL;
-	int fd;
 	char buf[4];
 	struct iovec iov = { buf, sizeof buf };
 
-	assert((fd = open("/dev/zero", O_RDONLY)) >= 0);
-	assert(pread(fd, buf, sizeof buf, offset) == 4);
-	assert(preadv(fd, &iov, 1, offset) == 4);
-	assert(!close(fd));
+	(void) close(0);
+	assert(open("/dev/zero", O_RDONLY) == 0);
+	assert(pread(0, buf, sizeof buf, offset) == 4);
+	assert(preadv(0, &iov, 1, offset) == 4);
+	assert(!close(0));
 
-	assert((fd = open("/dev/null", O_WRONLY)) >= 0);
-	assert(pwrite(fd, buf, sizeof buf, offset) == 4);
-	assert(pwritev(fd, &iov, 1, offset) == 4);
-	assert(!close(fd));
+	assert(open("/dev/null", O_WRONLY) == 0);
+	assert(pwrite(0, buf, sizeof buf, offset) == 4);
+	assert(pwritev(0, &iov, 1, offset) == 4);
+	assert(!close(0));
 
 	return 0;
 #else
diff --git a/tests/uio.expected b/tests/uio.expected
index 999b88cc..b4aa5474 100644
--- a/tests/uio.expected
+++ b/tests/uio.expected
@@ -1,4 +1,4 @@
-pread(64)?\(3, "\\0\\0\\0\\0", 4, 1004211379570065135\) += 4
-preadv\(3, \[{"\\0\\0\\0\\0", 4}\], 1, 1004211379570065135\) += 4
-pwrite(64)?\(3, "\\0\\0\\0\\0", 4, 1004211379570065135\) += 4
-pwritev\(3, \[{"\\0\\0\\0\\0", 4}\], 1, 1004211379570065135\) += 4
+pread(64)?\(0, "\\0\\0\\0\\0", 4, 1004211379570065135\) += 4
+preadv\(0, \[{"\\0\\0\\0\\0", 4}\], 1, 1004211379570065135\) += 4
+pwrite(64)?\(0, "\\0\\0\\0\\0", 4, 1004211379570065135\) += 4
+pwritev\(0, \[{"\\0\\0\\0\\0", 4}\], 1, 1004211379570065135\) += 4