diff --git a/Userland/Libraries/LibWeb/Crypto/Crypto.cpp b/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
index 0779adbdce..e5bef6a2f3 100644
--- a/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
+++ b/Userland/Libraries/LibWeb/Crypto/Crypto.cpp
@@ -12,6 +12,7 @@
 #include <LibWeb/Bindings/Intrinsics.h>
 #include <LibWeb/Crypto/Crypto.h>
 #include <LibWeb/Crypto/SubtleCrypto.h>
+#include <LibWeb/WebIDL/Buffers.h>
 
 namespace Web::Crypto {
 
@@ -42,24 +43,23 @@ JS::NonnullGCPtr<SubtleCrypto> Crypto::subtle() const
 }
 
 // https://w3c.github.io/webcrypto/#dfn-Crypto-method-getRandomValues
-WebIDL::ExceptionOr<JS::Value> Crypto::get_random_values(JS::Value array) const
+WebIDL::ExceptionOr<JS::Handle<WebIDL::ArrayBufferView>> Crypto::get_random_values(JS::Handle<WebIDL::ArrayBufferView> array) const
 {
     // 1. If array is not an Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array, then throw a TypeMismatchError and terminate the algorithm.
-    if (!array.is_object() || !(is<JS::Int8Array>(array.as_object()) || is<JS::Uint8Array>(array.as_object()) || is<JS::Uint8ClampedArray>(array.as_object()) || is<JS::Int16Array>(array.as_object()) || is<JS::Uint16Array>(array.as_object()) || is<JS::Int32Array>(array.as_object()) || is<JS::Uint32Array>(array.as_object()) || is<JS::BigInt64Array>(array.as_object()) || is<JS::BigUint64Array>(array.as_object())))
+    if (!array->is_typed_array_base())
         return WebIDL::TypeMismatchError::create(realm(), "array must be one of Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, or BigUint64Array"_fly_string);
-    auto& typed_array = static_cast<JS::TypedArrayBase&>(array.as_object());
 
     // 2. If the byteLength of array is greater than 65536, throw a QuotaExceededError and terminate the algorithm.
-    if (typed_array.byte_length() > 65536)
+    if (array->viewed_array_buffer()->byte_length() > 65536)
         return WebIDL::QuotaExceededError::create(realm(), "array's byteLength may not be greater than 65536"_fly_string);
 
     // IMPLEMENTATION DEFINED: If the viewed array buffer is detached, throw a InvalidStateError and terminate the algorithm.
-    if (typed_array.viewed_array_buffer()->is_detached())
+    if (array->viewed_array_buffer()->is_detached())
         return WebIDL::InvalidStateError::create(realm(), "array is detached"_fly_string);
     // FIXME: Handle SharedArrayBuffers
 
     // 3. Overwrite all elements of array with cryptographically strong random values of the appropriate type.
-    fill_with_random(typed_array.viewed_array_buffer()->buffer());
+    fill_with_random(array->viewed_array_buffer()->buffer());
 
     // 4. Return array.
     return array;
diff --git a/Userland/Libraries/LibWeb/Crypto/Crypto.h b/Userland/Libraries/LibWeb/Crypto/Crypto.h
index 76b6eaad8a..95e34d95b5 100644
--- a/Userland/Libraries/LibWeb/Crypto/Crypto.h
+++ b/Userland/Libraries/LibWeb/Crypto/Crypto.h
@@ -23,7 +23,7 @@ public:
 
     JS::NonnullGCPtr<SubtleCrypto> subtle() const;
 
-    WebIDL::ExceptionOr<JS::Value> get_random_values(JS::Value array) const;
+    WebIDL::ExceptionOr<JS::Handle<WebIDL::ArrayBufferView>> get_random_values(JS::Handle<WebIDL::ArrayBufferView>) const;
     WebIDL::ExceptionOr<String> random_uuid() const;
 
 protected:
diff --git a/Userland/Libraries/LibWeb/Crypto/Crypto.idl b/Userland/Libraries/LibWeb/Crypto/Crypto.idl
index 1924b6fce0..4553a22ddf 100644
--- a/Userland/Libraries/LibWeb/Crypto/Crypto.idl
+++ b/Userland/Libraries/LibWeb/Crypto/Crypto.idl
@@ -5,8 +5,7 @@
 interface Crypto {
     [SecureContext] readonly attribute SubtleCrypto subtle;
 
-    // FIXME: the argument and the return value should be of type ArrayBufferView
-    any getRandomValues(any array);
+    ArrayBufferView getRandomValues(ArrayBufferView array);
 
     [SecureContext] DOMString randomUUID();
 };