diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
index d163fecb52..3629277041 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/DurationPrototype.cpp
@@ -359,8 +359,7 @@ JS_DEFINE_NATIVE_FUNCTION(DurationPrototype::round)
         // b. Set roundTo to ! OrdinaryObjectCreate(null).
         round_to = Object::create(global_object, nullptr);
 
-        // FIXME: "_smallestUnit_" is a spec bug, see https://github.com/tc39/proposal-temporal/pull/1931
-        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "_smallestUnit_", paramString).
+        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "smallestUnit", paramString).
         MUST(round_to->create_data_property_or_throw(vm.names.smallestUnit, vm.argument(0)));
     }
     // 5. Else,
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp
index 3b4a099737..5c2462f81f 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/InstantPrototype.cpp
@@ -265,8 +265,7 @@ JS_DEFINE_NATIVE_FUNCTION(InstantPrototype::round)
         // b. Set roundTo to ! OrdinaryObjectCreate(null).
         round_to = Object::create(global_object, nullptr);
 
-        // FIXME: "_smallestUnit_" is a spec bug, see https://github.com/tc39/proposal-temporal/pull/1931
-        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "_smallestUnit_", paramString).
+        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "smallestUnit", paramString).
         MUST(round_to->create_data_property_or_throw(vm.names.smallestUnit, vm.argument(0)));
     }
     // 5. Else,
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
index ea0e9b744e..248c571833 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainDateTimePrototype.cpp
@@ -641,8 +641,7 @@ JS_DEFINE_NATIVE_FUNCTION(PlainDateTimePrototype::round)
         // b. Set roundTo to ! OrdinaryObjectCreate(null).
         round_to = Object::create(global_object, nullptr);
 
-        // FIXME: "_smallestUnit_" is a spec bug, see https://github.com/tc39/proposal-temporal/pull/1931
-        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "_smallestUnit_", paramString).
+        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "smallestUnit", paramString).
         MUST(round_to->create_data_property_or_throw(vm.names.smallestUnit, vm.argument(0)));
     }
     // 5. Else,
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
index b8885c6937..311fc34fcc 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/PlainTimePrototype.cpp
@@ -365,8 +365,7 @@ JS_DEFINE_NATIVE_FUNCTION(PlainTimePrototype::round)
         // b. Set roundTo to ! OrdinaryObjectCreate(null).
         round_to = Object::create(global_object, nullptr);
 
-        // FIXME: "_smallestUnit_" is a spec bug, see https://github.com/tc39/proposal-temporal/pull/1931
-        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "_smallestUnit_", paramString).
+        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "smallestUnit", paramString).
         MUST(round_to->create_data_property_or_throw(vm.names.smallestUnit, vm.argument(0)));
     }
     // 5. Else,
diff --git a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
index 08d60aad31..3b2ac14201 100644
--- a/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
+++ b/Userland/Libraries/LibJS/Runtime/Temporal/ZonedDateTimePrototype.cpp
@@ -1117,8 +1117,7 @@ JS_DEFINE_NATIVE_FUNCTION(ZonedDateTimePrototype::round)
         // b. Set roundTo to ! OrdinaryObjectCreate(null).
         round_to = Object::create(global_object, nullptr);
 
-        // FIXME: "_smallestUnit_" is a spec bug, see https://github.com/tc39/proposal-temporal/pull/1931
-        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "_smallestUnit_", paramString).
+        // c. Perform ! CreateDataPropertyOrThrow(roundTo, "smallestUnit", paramString).
         MUST(round_to->create_data_property_or_throw(vm.names.smallestUnit, vm.argument(0)));
     }
     // 5. Else,