diff --git a/tests/test_buf.rs b/tests/test_buf.rs
index 5a1baedf5c3b217c390b6412ac89e9309b75d511..db516920c583406b5201b67f7ac35409e9ab7b0a 100644
--- a/tests/test_buf.rs
+++ b/tests/test_buf.rs
@@ -47,7 +47,12 @@ fn test_get_u16_buffer_underflow() {
 #[test]
 fn test_bufs_vec() {
     let buf = Cursor::new(b"hello world");
-    let mut dst: [&IoVec; 2] = Default::default();
+
+    let b1: &[u8] = &mut [0];
+    let b2: &[u8] = &mut [0];
+
+    let mut dst: [&IoVec; 2] =
+        [b1.into(), b2.into()];
 
     assert_eq!(1, buf.bytes_vec(&mut dst[..]));
 }
diff --git a/tests/test_chain.rs b/tests/test_chain.rs
index 002df590f024ee51ccfc1015e232d4d031c975bc..2789e7c0602de137ca2bb9074ba2a13a36575d42 100644
--- a/tests/test_chain.rs
+++ b/tests/test_chain.rs
@@ -55,48 +55,68 @@ fn vectored_read() {
     let mut buf = a.chain(b);
 
     {
-        let mut iovecs: [&IoVec; 4] = Default::default();
+        let b1: &[u8] = &mut [0];
+        let b2: &[u8] = &mut [0];
+        let b3: &[u8] = &mut [0];
+        let b4: &[u8] = &mut [0];
+        let mut iovecs: [&IoVec; 4] =
+            [b1.into(), b2.into(), b3.into(), b4.into()];
 
         assert_eq!(2, buf.bytes_vec(&mut iovecs));
         assert_eq!(iovecs[0][..], b"hello"[..]);
         assert_eq!(iovecs[1][..], b"world"[..]);
-        assert!(iovecs[2].is_empty());
-        assert!(iovecs[3].is_empty());
+        assert_eq!(iovecs[2][..], b"\0"[..]);
+        assert_eq!(iovecs[3][..], b"\0"[..]);
     }
 
     buf.advance(2);
 
     {
-        let mut iovecs: [&IoVec; 4] = Default::default();
+        let b1: &[u8] = &mut [0];
+        let b2: &[u8] = &mut [0];
+        let b3: &[u8] = &mut [0];
+        let b4: &[u8] = &mut [0];
+        let mut iovecs: [&IoVec; 4] =
+            [b1.into(), b2.into(), b3.into(), b4.into()];
 
         assert_eq!(2, buf.bytes_vec(&mut iovecs));
         assert_eq!(iovecs[0][..], b"llo"[..]);
         assert_eq!(iovecs[1][..], b"world"[..]);
-        assert!(iovecs[2].is_empty());
-        assert!(iovecs[3].is_empty());
+        assert_eq!(iovecs[2][..], b"\0"[..]);
+        assert_eq!(iovecs[3][..], b"\0"[..]);
     }
 
     buf.advance(3);
 
     {
-        let mut iovecs: [&IoVec; 4] = Default::default();
+        let b1: &[u8] = &mut [0];
+        let b2: &[u8] = &mut [0];
+        let b3: &[u8] = &mut [0];
+        let b4: &[u8] = &mut [0];
+        let mut iovecs: [&IoVec; 4] =
+            [b1.into(), b2.into(), b3.into(), b4.into()];
 
         assert_eq!(1, buf.bytes_vec(&mut iovecs));
         assert_eq!(iovecs[0][..], b"world"[..]);
-        assert!(iovecs[1].is_empty());
-        assert!(iovecs[2].is_empty());
-        assert!(iovecs[3].is_empty());
+        assert_eq!(iovecs[1][..], b"\0"[..]);
+        assert_eq!(iovecs[2][..], b"\0"[..]);
+        assert_eq!(iovecs[3][..], b"\0"[..]);
     }
 
     buf.advance(3);
 
     {
-        let mut iovecs: [&IoVec; 4] = Default::default();
+        let b1: &[u8] = &mut [0];
+        let b2: &[u8] = &mut [0];
+        let b3: &[u8] = &mut [0];
+        let b4: &[u8] = &mut [0];
+        let mut iovecs: [&IoVec; 4] =
+            [b1.into(), b2.into(), b3.into(), b4.into()];
 
         assert_eq!(1, buf.bytes_vec(&mut iovecs));
         assert_eq!(iovecs[0][..], b"ld"[..]);
-        assert!(iovecs[1].is_empty());
-        assert!(iovecs[2].is_empty());
-        assert!(iovecs[3].is_empty());
+        assert_eq!(iovecs[1][..], b"\0"[..]);
+        assert_eq!(iovecs[2][..], b"\0"[..]);
+        assert_eq!(iovecs[3][..], b"\0"[..]);
     }
 }