diff --git a/src/lib.rs b/src/lib.rs
index 2f1b3a2..52b19e3 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -93,9 +93,9 @@ fn init() {
 pub struct Comparison(Changeset);
 
 impl Comparison {
-    pub fn new<TLeft: Debug, TRight: Debug>(left: &TLeft, right: &TRight) -> Comparison {
-        let left_dbg = format!("{:#?}", *left);
-        let right_dbg = format!("{:#?}", *right);
+    pub fn new<TLeft: Debug + ?Sized, TRight: Debug + ?Sized>(left: &TLeft, right: &TRight) -> Comparison {
+        let left_dbg = format!("{:#?}", &*left);
+        let right_dbg = format!("{:#?}", &*right);
         let changeset = Changeset::new(&left_dbg, &right_dbg, "\n");
 
         Comparison(changeset)
@@ -157,8 +157,8 @@ macro_rules! assert_ne {
         match (&($left), &($right)) {
             (left_val, right_val) => {
                 if *left_val == *right_val {
-                  let left_dbg = format!("{:?}", *left_val);
-                  let right_dbg = format!("{:?}", *right_val);
+                  let left_dbg = format!("{:?}", &*left_val);
+                  let right_dbg = format!("{:?}", &*right_val);
                   if left_dbg != right_dbg {
 
                       panic!("assertion failed: `(left != right)`{}{}\
diff --git a/tests/assert_eq.rs b/tests/assert_eq.rs
index cadab93..85f0173 100644
--- a/tests/assert_eq.rs
+++ b/tests/assert_eq.rs
@@ -193,3 +193,9 @@ fn assert_eq_custom_trailing_comma() {
 
     assert_eq!(x, y, "custom panic message",);
 }
+
+#[test]
+fn assert_eq_unsized() {
+    let a: &[u8] = b"e";
+    assert_eq!(*a, *a);
+}
diff --git a/tests/assert_ne.rs b/tests/assert_ne.rs
index 7218f72..70425fe 100644
--- a/tests/assert_ne.rs
+++ b/tests/assert_ne.rs
@@ -172,3 +172,10 @@ fn assert_ne_custom_trailing_comma() {
 
     assert_ne!(x, x, "custom panic message",);
 }
+
+#[test]
+fn assert_ne_unsized() {
+    let a: &[u8] = b"e";
+    let b: &[u8] = b"ee";
+    assert_ne!(*a, *b);
+}