diff --git a/CHANGELOG.md b/CHANGELOG.md
index ef587802ef..44de803bc4 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@
 - Do not PII-scrub code locations by default. ([#3116](https://github.com/getsentry/relay/pull/3116))
 - Accept transactions with unfinished spans. ([#3162](https://github.com/getsentry/relay/pull/3162))
 - Don't run validation on renormalization, and don't normalize spans from librelay calls. ([#3214](https://github.com/getsentry/relay/pull/3214))
+- Set segment_id as optional ([#3275](https://github.com/getsentry/relay/pull/3275))
 
 **Internal**:
 
diff --git a/relay-profiling/src/android.rs b/relay-profiling/src/android.rs
index df8b063f84..eecb6d0248 100644
--- a/relay-profiling/src/android.rs
+++ b/relay-profiling/src/android.rs
@@ -219,7 +219,7 @@ pub fn parse_android_profile(
 
     if let Some(segment_id) = transaction_metadata.get("segment_id") {
         if let Some(transaction_metadata) = profile.metadata.transaction.as_mut() {
-            transaction_metadata.segment_id = SpanId(segment_id.to_owned());
+            transaction_metadata.segment_id = Some(SpanId(segment_id.to_owned()));
         }
     }
 
diff --git a/relay-profiling/src/sample.rs b/relay-profiling/src/sample.rs
index 75e83d6310..5ac3081ba3 100644
--- a/relay-profiling/src/sample.rs
+++ b/relay-profiling/src/sample.rs
@@ -395,7 +395,7 @@ pub fn parse_sample_profile(
 
     if let Some(segment_id) = transaction_metadata.get("segment_id") {
         if let Some(transaction_metadata) = profile.metadata.transaction.as_mut() {
-            transaction_metadata.segment_id = SpanId(segment_id.to_owned());
+            transaction_metadata.segment_id = Some(SpanId(segment_id.to_owned()));
         }
     }
 
@@ -557,7 +557,7 @@ mod tests {
             relative_end_ns: 30,
             relative_start_ns: 10,
             trace_id: EventId::new(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         });
         profile.profile.stacks.push(vec![0]);
         profile.profile.samples.extend(vec![
@@ -609,7 +609,7 @@ mod tests {
             relative_end_ns: 100,
             relative_start_ns: 50,
             trace_id: EventId::new(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         });
         profile.profile.stacks.push(vec![0]);
         profile.profile.samples.extend(vec![
@@ -657,7 +657,7 @@ mod tests {
             relative_end_ns: 100,
             relative_start_ns: 0,
             trace_id: EventId::new(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
 
         profile.metadata.transactions.push(transaction.clone());
@@ -718,7 +718,7 @@ mod tests {
             relative_end_ns: 100,
             relative_start_ns: 0,
             trace_id: EventId::new(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
 
         profile.metadata.transaction = Some(transaction);
@@ -832,7 +832,7 @@ mod tests {
             relative_end_ns: 100,
             relative_start_ns: 0,
             trace_id: EventId::new(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
 
         profile.metadata.transaction = Some(transaction);
diff --git a/relay-profiling/src/transaction_metadata.rs b/relay-profiling/src/transaction_metadata.rs
index 6b71d918a8..d6c6a7eb3c 100644
--- a/relay-profiling/src/transaction_metadata.rs
+++ b/relay-profiling/src/transaction_metadata.rs
@@ -8,7 +8,8 @@ pub struct TransactionMetadata {
     pub id: EventId,
     pub name: String,
     pub trace_id: EventId,
-    pub segment_id: SpanId,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub segment_id: Option<SpanId>,
 
     #[serde(default, deserialize_with = "deserialize_number_from_string")]
     pub active_thread_id: u64,
@@ -66,7 +67,7 @@ mod tests {
             relative_end_ns: 133,
             relative_start_ns: 1,
             trace_id: "4705BD13-368A-499A-AA48-439DAFD9CFB0".parse().unwrap(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
         assert!(metadata.valid());
     }
@@ -82,7 +83,7 @@ mod tests {
             relative_end_ns: 133,
             relative_start_ns: 1,
             trace_id: "4705BD13-368A-499A-AA48-439DAFD9CFB0".parse().unwrap(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
         assert!(!metadata.valid());
     }
@@ -98,7 +99,7 @@ mod tests {
             relative_end_ns: 0,
             relative_start_ns: 0,
             trace_id: "4705BD13-368A-499A-AA48-439DAFD9CFB0".parse().unwrap(),
-            segment_id: SpanId("bd2eb23da2beb459".to_string()),
+            segment_id: Some(SpanId("bd2eb23da2beb459".to_string())),
         };
         assert!(metadata.valid());
     }