diff --git a/src/ord.rs b/src/ord.rs
index 21397ef..ccb5259 100644
--- a/src/ord.rs
+++ b/src/ord.rs
@@ -11,8 +11,8 @@ impl PartialEq for SmallUint {
                 Ordering::Greater => false,
                 Ordering::Less => false,
                 Ordering::Equal => {
-                    let slice1 = unsafe { core::slice::from_raw_parts(r, *s) };
-                    let slice2 = unsafe { core::slice::from_raw_parts(i, *j) };
+                    let slice1 = unsafe { core::slice::from_raw_parts(*r, *s) };
+                    let slice2 = unsafe { core::slice::from_raw_parts(*i, *j) };
                     for i in 0..*s {
                         match slice1[s - 1 - i].cmp(&slice2[s - 1 - i]) {
                             Ordering::Less => return false,
@@ -71,8 +71,8 @@ impl PartialEq for SmallInt {
                     Ordering::Equal => {
                         let us = s.unsigned_abs();
                         let uj = j.unsigned_abs();
-                        let slice1 = unsafe { core::slice::from_raw_parts(r, us) };
-                        let slice2 = unsafe { core::slice::from_raw_parts(i, uj) };
+                        let slice1 = unsafe { core::slice::from_raw_parts(*r, us) };
+                        let slice2 = unsafe { core::slice::from_raw_parts(*i, uj) };
                         for i in 0..*s {
                             match slice1[(s - 1 - i) as usize].cmp(&slice2[(s - 1 - i) as usize]) {
                                 Ordering::Less => return false,
diff --git a/src/tests.rs b/src/tests.rs
index 67575f1..a49cb8d 100644
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -119,6 +119,20 @@ fn run_tests_i_2<T: Eq + Debug>(
     }));
 }
 
+#[test]
+#[cfg(feature = "num-bigint")]
+fn test_convert_biguint() {
+    run_tests_u_1(|i| BigUint::from(&i), |i| i.clone());
+    run_tests_u_1(|i| i, |i| SmallUint::from(i));
+}
+
+#[test]
+#[cfg(feature = "num-bigint")]
+fn test_convert_bigint() {
+    run_tests_i_1(|i| BigInt::from(&i), |i| i.clone());
+    run_tests_i_1(|i| i, |i| SmallInt::from(i));
+}
+
 #[test]
 #[cfg(feature = "num-bigint")]
 fn test_cmp_u() {