diff --git a/src/workerd/io/trace-streaming-test.c++ b/src/workerd/io/trace-streaming-test.c++
index b131310882f..1a50848706a 100644
--- a/src/workerd/io/trace-streaming-test.c++
+++ b/src/workerd/io/trace-streaming-test.c++
@@ -154,8 +154,7 @@ KJ_TEST("We can create a simple, streaming trace session with a single explicitl
 
     streamingTrace->setEventInfo(trace::FetchEventInfo(
         kj::HttpMethod::GET, kj::str("http://example.com"), kj::String(), {}));
-    auto span =
-        KJ_ASSERT_NONNULL(streamingTrace->newChildSpan(0 * kj::MILLISECONDS + kj::UNIX_EPOCH));
+    auto span = KJ_ASSERT_NONNULL(streamingTrace->newChildSpan());
     span->addMark("bar");
     // Intentionally not calling setOutcome on the span.
     streamingTrace->setOutcome(trace::Outcome(EventOutcome::CANCELED));
diff --git a/src/workerd/io/trace-streaming.c++ b/src/workerd/io/trace-streaming.c++
index 098761ba6d9..c4a3ae0e47e 100644
--- a/src/workerd/io/trace-streaming.c++
+++ b/src/workerd/io/trace-streaming.c++
@@ -173,7 +173,7 @@ void StreamingTrace::addDropped(uint32_t start, uint32_t end) {
 }
 
 kj::Maybe<kj::Own<StreamingTrace::Span>> StreamingTrace::newChildSpan(
-    kj::Date timestamp, trace::Tags tags, Options options) {
+    trace::Tags tags, Options options) {
   KJ_IF_SOME(i, impl) {
     KJ_REQUIRE_NONNULL(i->onsetInfo.info, "the event info must be set before other events");
     return kj::heap<StreamingTrace::Span>(spans, *this, 0, kj::mv(tags), options);
@@ -395,7 +395,7 @@ void StreamingTrace::Span::addCustom(trace::Tags&& tags) {
 }
 
 kj::Maybe<kj::Own<StreamingTrace::Span>> StreamingTrace::Span::newChildSpan(
-    kj::Date timestamp, trace::Tags tags, Options options) {
+    trace::Tags tags, Options options) {
   KJ_IF_SOME(i, impl) {
     return kj::heap<Span>(spans, i->trace, i->id, kj::mv(tags), options);
   }
diff --git a/src/workerd/io/trace-streaming.h b/src/workerd/io/trace-streaming.h
index 1c45be6a467..270680e67ce 100644
--- a/src/workerd/io/trace-streaming.h
+++ b/src/workerd/io/trace-streaming.h
@@ -184,7 +184,7 @@ class StreamingTrace final: public SpanBase {
     void addSubrequestOutcome(trace::SubrequestOutcome&& outcome) override;
     void addCustom(trace::Tags&& tags) override;
     kj::Maybe<kj::Own<Span>> newChildSpan(
-        kj::Date timestamp, trace::Tags tags = nullptr, Options options = Options::NONE);
+        trace::Tags tags = nullptr, Options options = Options::NONE);
 
     // Setting the outcome of the span explicitly closes the span, after which
     // no further events can be emitted.
@@ -234,7 +234,7 @@ class StreamingTrace final: public SpanBase {
   void addSubrequestOutcome(trace::SubrequestOutcome&& outcome) override;
   void addCustom(trace::Tags&& tags) override;
   kj::Maybe<kj::Own<Span>> newChildSpan(
-      kj::Date timestamp, trace::Tags tags = nullptr, Options options = Options::NONE);
+      trace::Tags tags = nullptr, Options options = Options::NONE);
 
 private:
   struct Impl;