diff --git a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
index 4efa582a9fb..d9f88f547e4 100644
--- a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
+++ b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
@@ -323,6 +323,13 @@ FLATTEN UnsignedBigInteger UnsignedBigInteger::gcd(UnsignedBigInteger const& oth
     return result;
 }
 
+FLATTEN UnsignedBigInteger UnsignedBigInteger::lcm(UnsignedBigInteger const& other) const
+{
+    UnsignedBigInteger result;
+    MP_MUST(mp_lcm(&m_mp, &other.m_mp, &result.m_mp));
+    return result;
+}
+
 u32 UnsignedBigInteger::hash() const
 {
     if (m_hash.has_value())
diff --git a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
index a2ba5d66dbf..85d28261ac7 100644
--- a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
+++ b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
@@ -80,6 +80,7 @@ public:
     [[nodiscard]] UnsignedDivisionResult divided_by(UnsignedBigInteger const& divisor) const;
     [[nodiscard]] UnsignedBigInteger pow(u32 exponent) const;
     [[nodiscard]] UnsignedBigInteger gcd(UnsignedBigInteger const& other) const;
+    [[nodiscard]] UnsignedBigInteger lcm(UnsignedBigInteger const& other) const;
 
     [[nodiscard]] u32 hash() const;