diff --git a/Userland/Libraries/LibJS/Runtime/Value.cpp b/Userland/Libraries/LibJS/Runtime/Value.cpp
index bf00d3780e..7a7a0e3756 100644
--- a/Userland/Libraries/LibJS/Runtime/Value.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Value.cpp
@@ -71,7 +71,7 @@ ALWAYS_INLINE bool both_bigint(Value const& lhs, Value const& rhs)
 
 // 6.1.6.1.20 Number::toString ( x ), https://tc39.es/ecma262/#sec-numeric-types-number-tostring
 // Implementation for radix = 10
-static String double_to_string(double d)
+String number_to_string(double d, NumberToStringMode mode)
 {
     auto convert_to_decimal_digits_array = [](auto x, auto& digits, auto& length) {
         for (; x; x /= 10)
@@ -116,8 +116,12 @@ static String double_to_string(double d)
     if (sign)
         builder.append('-');
 
+    // Non-standard: Intl needs number-to-string conversions for extremely large numbers without any
+    // exponential formatting, as it will handle such formatting itself in a locale-aware way.
+    bool force_no_exponent = mode == NumberToStringMode::WithoutExponent;
+
     // 6. If radix ≠ 10 or n is in the inclusive interval from -5 to 21, then
-    if (n >= -5 && n <= 21) {
+    if ((n >= -5 && n <= 21) || force_no_exponent) {
         // a. If n ≥ k, then
         if (n >= k) {
             // i. Return the string-concatenation of:
@@ -299,7 +303,7 @@ String Value::typeof() const
 String Value::to_string_without_side_effects() const
 {
     if (is_double())
-        return double_to_string(m_value.as_double);
+        return number_to_string(m_value.as_double);
 
     switch (m_value.tag) {
     case UNDEFINED_TAG:
@@ -337,7 +341,7 @@ ThrowCompletionOr<PrimitiveString*> Value::to_primitive_string(VM& vm)
 ThrowCompletionOr<String> Value::to_string(VM& vm) const
 {
     if (is_double())
-        return double_to_string(m_value.as_double);
+        return number_to_string(m_value.as_double);
 
     switch (m_value.tag) {
     case UNDEFINED_TAG:
diff --git a/Userland/Libraries/LibJS/Runtime/Value.h b/Userland/Libraries/LibJS/Runtime/Value.h
index ef65ca09cc..f23c3dc881 100644
--- a/Userland/Libraries/LibJS/Runtime/Value.h
+++ b/Userland/Libraries/LibJS/Runtime/Value.h
@@ -564,6 +564,11 @@ ThrowCompletionOr<TriState> is_less_than(VM&, Value lhs, Value rhs, bool left_fi
 
 double to_integer_or_infinity(double);
 
+enum class NumberToStringMode {
+    WithExponent,
+    WithoutExponent,
+};
+String number_to_string(double, NumberToStringMode = NumberToStringMode::WithExponent);
 Optional<Value> string_to_number(StringView);
 
 inline bool Value::operator==(Value const& value) const { return same_value(*this, value); }