diff --git a/qlog/src/events/quic.rs b/qlog/src/events/quic.rs
index a7c1fa3225..b5e9c6cdf9 100644
--- a/qlog/src/events/quic.rs
+++ b/qlog/src/events/quic.rs
@@ -646,11 +646,18 @@ pub struct PacketSent {
 
     pub trigger: Option<PacketSentTrigger>,
 
-    pub send_at_time: Option<f32>,
+    #[serde(flatten)]
+    pub extension: PacketSentExtension,
 
     pub frames: Option<SmallVec<[QuicFrame; 1]>>,
 }
 
+#[serde_with::skip_serializing_none]
+#[derive(Serialize, Deserialize, Clone, PartialEq, Debug)]
+pub struct PacketSentExtension {
+    pub send_at_time: Option<f32>,
+}
+
 #[serde_with::skip_serializing_none]
 #[derive(Serialize, Deserialize, Clone, PartialEq, Eq, Debug)]
 pub struct PacketDropped {
diff --git a/qlog/src/lib.rs b/qlog/src/lib.rs
index 68ff278fcd..92235ceef1 100644
--- a/qlog/src/lib.rs
+++ b/qlog/src/lib.rs
@@ -141,7 +141,9 @@
 //!         supported_versions: None,
 //!         raw: Some(raw),
 //!         datagram_id: None,
-//!         send_at_time: None,
+//!         extension: qlog::events::quic::PacketSentExtension {
+//!             send_at_time: None,
+//!         },
 //!         trigger: None,
 //!     });
 //!
@@ -345,7 +347,9 @@
 //!         supported_versions: None,
 //!         raw: None,
 //!         datagram_id: None,
-//!         send_at_time: None,
+//!         extension: qlog::events::quic::PacketSentExtension {
+//!             send_at_time: None,
+//!         },
 //!         trigger: None,
 //!     });
 //!
@@ -718,6 +722,7 @@ pub mod testing {
 mod tests {
     use super::*;
     use crate::events::quic::PacketSent;
+    use crate::events::quic::PacketSentExtension;
     use crate::events::quic::PacketType;
     use crate::events::quic::QuicFrame;
     use crate::events::EventData;
@@ -760,7 +765,7 @@ mod tests {
                 data: None,
             }),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
@@ -830,7 +835,7 @@ mod tests {
                 data: None,
             }),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
@@ -950,7 +955,7 @@ mod tests {
                 data: None,
             }),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
diff --git a/qlog/src/streamer.rs b/qlog/src/streamer.rs
index 16761b3a67..4624b09fca 100644
--- a/qlog/src/streamer.rs
+++ b/qlog/src/streamer.rs
@@ -265,6 +265,7 @@ mod tests {
 
     use super::*;
     use crate::events::quic;
+    use crate::events::quic::PacketSentExtension;
     use crate::events::quic::QuicFrame;
     use crate::events::RawInfo;
     use smallvec::smallvec;
@@ -303,7 +304,7 @@ mod tests {
             supported_versions: None,
             raw: raw.clone(),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
@@ -334,7 +335,7 @@ mod tests {
             supported_versions: None,
             raw: raw.clone(),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
@@ -349,7 +350,7 @@ mod tests {
             supported_versions: None,
             raw,
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
@@ -478,7 +479,7 @@ mod tests {
             supported_versions: None,
             raw: raw.clone(),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
         let j1 = json!({"foo": "Bar", "hello": 123});
@@ -506,7 +507,7 @@ mod tests {
             supported_versions: None,
             raw: raw.clone(),
             datagram_id: None,
-            send_at_time: None,
+            extension: PacketSentExtension { send_at_time: None },
             trigger: None,
         });
 
diff --git a/quiche/src/lib.rs b/quiche/src/lib.rs
index ef1946080b..6ec616d493 100644
--- a/quiche/src/lib.rs
+++ b/quiche/src/lib.rs
@@ -4456,7 +4456,10 @@ impl Connection {
                         supported_versions: None,
                         raw: Some(qlog_raw_info),
                         datagram_id: None,
-                        send_at_time: Some(send_at_time),
+                        extension: qlog::events::quic::PacketSentExtension {
+                            send_at_time: Some(send_at_time),
+                        },
+
                         trigger: None,
                     });