diff --git a/Tests/LibCrypto/TestBigInteger.cpp b/Tests/LibCrypto/TestBigInteger.cpp
index 3a94712739..e28fdf8b75 100644
--- a/Tests/LibCrypto/TestBigInteger.cpp
+++ b/Tests/LibCrypto/TestBigInteger.cpp
@@ -73,7 +73,7 @@ TEST_CASE(test_unsigned_bigint_basic_add_to_accumulator)
 
 TEST_CASE(test_unsigned_bigint_basic_add_to_empty_accumulator)
 {
-    Crypto::UnsignedBigInteger num1({});
+    Crypto::UnsignedBigInteger num1 {};
     Crypto::UnsignedBigInteger num2(10);
     Crypto::UnsignedBigIntegerAlgorithms::add_into_accumulator_without_allocation(num1, num2);
     EXPECT_EQ(num1.words(), Vector<u32> { 10 });
diff --git a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
index 4a881df0a4..6e0b48ee23 100644
--- a/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
+++ b/Userland/Libraries/LibCrypto/BigInt/SignedBigInteger.h
@@ -16,9 +16,11 @@ struct SignedDivisionResult;
 
 class SignedBigInteger {
 public:
-    SignedBigInteger(i32 x)
-        : m_sign(x < 0)
-        , m_unsigned_data(abs(x))
+    template<typename T>
+    requires(IsSigned<T> && sizeof(T) <= sizeof(i32))
+        SignedBigInteger(T value)
+        : m_sign(value < 0)
+        , m_unsigned_data(abs(static_cast<i32>(value)))
     {
     }
 
diff --git a/Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h b/Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
index fd413308db..780853a087 100644
--- a/Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
+++ b/Userland/Libraries/LibCrypto/BigInt/UnsignedBigInteger.h
@@ -24,7 +24,13 @@ public:
     using Word = u32;
     static constexpr size_t BITS_IN_WORD = 32;
 
-    UnsignedBigInteger(Word x) { m_words.append(x); }
+    // This constructor accepts any unsigned with size up to Word.
+    template<typename T>
+    requires(IsIntegral<T> && sizeof(T) <= sizeof(Word))
+        UnsignedBigInteger(T value)
+    {
+        m_words.append(static_cast<Word>(value));
+    }
 
     explicit UnsignedBigInteger(Vector<Word, STARTING_WORD_SIZE>&& words)
         : m_words(move(words))