diff --git a/src/bigint.rs b/src/bigint.rs
index 891eeb46..ab775f98 100644
--- a/src/bigint.rs
+++ b/src/bigint.rs
@@ -82,6 +82,13 @@ impl Clone for BigInt {
     }
 }
 
+impl From<&BigInt> for BigInt {
+    #[inline]
+    fn from(value: &BigInt) -> Self {
+        value.clone()
+    }
+}
+
 impl hash::Hash for BigInt {
     #[inline]
     fn hash<H: hash::Hasher>(&self, state: &mut H) {
diff --git a/src/biguint.rs b/src/biguint.rs
index 271a8837..c3f962cd 100644
--- a/src/biguint.rs
+++ b/src/biguint.rs
@@ -55,6 +55,13 @@ impl Clone for BigUint {
     }
 }
 
+impl From<&BigUint> for BigUint {
+    #[inline]
+    fn from(value: &BigUint) -> Self {
+        value.clone()
+    }
+}
+
 impl hash::Hash for BigUint {
     #[inline]
     fn hash<H: hash::Hasher>(&self, state: &mut H) {