diff --git a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
index 1af99881465..4496a30c8d8 100644
--- a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
+++ b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.cpp
@@ -601,6 +601,11 @@ bool UnsignedBigInteger::operator<(UnsignedBigInteger const& other) const
     return false;
 }
 
+bool UnsignedBigInteger::operator<=(UnsignedBigInteger const& other) const
+{
+    return *this < other || *this == other;
+}
+
 bool UnsignedBigInteger::operator>(UnsignedBigInteger const& other) const
 {
     return *this != other && !(*this < other);
diff --git a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
index 49839fc09e0..bf606d8fc95 100644
--- a/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
+++ b/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
@@ -128,6 +128,7 @@ public:
     [[nodiscard]] bool operator==(UnsignedBigInteger const& other) const;
     [[nodiscard]] bool operator!=(UnsignedBigInteger const& other) const;
     [[nodiscard]] bool operator<(UnsignedBigInteger const& other) const;
+    [[nodiscard]] bool operator<=(UnsignedBigInteger const& other) const;
     [[nodiscard]] bool operator>(UnsignedBigInteger const& other) const;
     [[nodiscard]] bool operator>=(UnsignedBigInteger const& other) const;