diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
index 58815a4d80..ceed329aa3 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.cpp
@@ -796,7 +796,7 @@ ThrowCompletionOr<ISODateTime> parse_iso_date_time(GlobalObject& global_object,
 }
 
 // 13.35 ParseTemporalInstantString ( isoString ), https://tc39.es/proposal-temporal/#sec-temporal-parsetemporalinstantstring
-Optional<TemporalInstant> parse_temporal_instant_string(GlobalObject& global_object, String const& iso_string)
+ThrowCompletionOr<TemporalInstant> parse_temporal_instant_string(GlobalObject& global_object, String const& iso_string)
 {
     auto& vm = global_object.vm();
 
@@ -811,8 +811,8 @@ Optional<TemporalInstant> parse_temporal_instant_string(GlobalObject& global_obj
 
     // 4. Let timeZoneResult be ? ParseTemporalTimeZoneString(isoString).
     auto time_zone_result = parse_temporal_time_zone_string(global_object, iso_string);
-    if (vm.exception())
-        return {};
+    if (auto* exception = vm.exception())
+        return throw_completion(exception->value());
 
     // 5. Let offsetString be timeZoneResult.[[OffsetString]].
     auto offset_string = time_zone_result->offset;
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h
index 894ae7414e..77795a14b5 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/AbstractOperations.h
@@ -104,7 +104,7 @@ String format_seconds_string_part(u8 second, u16 millisecond, u16 microsecond, u
 double constrain_to_range(double x, double minimum, double maximum);
 BigInt* round_number_to_increment(GlobalObject&, BigInt const&, u64 increment, StringView rounding_mode);
 ThrowCompletionOr<ISODateTime> parse_iso_date_time(GlobalObject&, String const& iso_string);
-Optional<TemporalInstant> parse_temporal_instant_string(GlobalObject&, String const& iso_string);
+ThrowCompletionOr<TemporalInstant> parse_temporal_instant_string(GlobalObject&, String const& iso_string);
 Optional<String> parse_temporal_calendar_string(GlobalObject&, String const& iso_string);
 Optional<TemporalDate> parse_temporal_date_string(GlobalObject&, String const& iso_string);
 Optional<ISODateTime> parse_temporal_date_time_string(GlobalObject&, String const& iso_string);
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
index 7e194666fd..70c3296730 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/Instant.cpp
@@ -112,18 +112,16 @@ BigInt* parse_temporal_instant(GlobalObject& global_object, String const& iso_st
     // 1. Assert: Type(isoString) is String.
 
     // 2. Let result be ? ParseTemporalInstantString(isoString).
-    auto result = parse_temporal_instant_string(global_object, iso_string);
-    if (vm.exception())
-        return {};
+    auto result = TRY_OR_DISCARD(parse_temporal_instant_string(global_object, iso_string));
 
     // 3. Let offsetString be result.[[TimeZoneOffsetString]].
-    auto& offset_string = result->time_zone_offset;
+    auto& offset_string = result.time_zone_offset;
 
     // 4. Assert: offsetString is not undefined.
     VERIFY(offset_string.has_value());
 
     // 5. Let utc be ? GetEpochFromISOParts(result.[[Year]], result.[[Month]], result.[[Day]], result.[[Hour]], result.[[Minute]], result.[[Second]], result.[[Millisecond]], result.[[Microsecond]], result.[[Nanosecond]]).
-    auto* utc = get_epoch_from_iso_parts(global_object, result->year, result->month, result->day, result->hour, result->minute, result->second, result->millisecond, result->microsecond, result->nanosecond);
+    auto* utc = get_epoch_from_iso_parts(global_object, result.year, result.month, result.day, result.hour, result.minute, result.second, result.millisecond, result.microsecond, result.nanosecond);
     if (vm.exception())
         return {};