diff --git a/protobuf/flow/entities/execution_result.proto b/protobuf/flow/entities/execution_result.proto
index e551581c2..54a1bc060 100644
--- a/protobuf/flow/entities/execution_result.proto
+++ b/protobuf/flow/entities/execution_result.proto
@@ -26,7 +26,7 @@ message Chunk {
   bytes end_state = 8;  // EndState inferred from next chunk or from the ER
   bytes execution_data_id = 9;
   bytes state_delta_commitment = 10; // a commitment over sorted list of register changes
-  optional uint32 service_event_count =
+  uint32 service_event_count =
       11; // number of service events emitted in this chunk (present in Protocol Version 2+)
 }
 
diff --git a/protobuf/go/flow/entities/execution_result.pb.go b/protobuf/go/flow/entities/execution_result.pb.go
index 9ae6bd6d3..22f1c6a02 100644
--- a/protobuf/go/flow/entities/execution_result.pb.go
+++ b/protobuf/go/flow/entities/execution_result.pb.go
@@ -103,6 +103,7 @@ type Chunk struct {
 	EndState             []byte   `protobuf:"bytes,8,opt,name=end_state,json=endState,proto3" json:"end_state,omitempty"`
 	ExecutionDataId      []byte   `protobuf:"bytes,9,opt,name=execution_data_id,json=executionDataId,proto3" json:"execution_data_id,omitempty"`
 	StateDeltaCommitment []byte   `protobuf:"bytes,10,opt,name=state_delta_commitment,json=stateDeltaCommitment,proto3" json:"state_delta_commitment,omitempty"`
+	ServiceEventCount    uint32   `protobuf:"varint,11,opt,name=service_event_count,json=serviceEventCount,proto3" json:"service_event_count,omitempty"`
 	XXX_NoUnkeyedLiteral struct{} `json:"-"`
 	XXX_unrecognized     []byte   `json:"-"`
 	XXX_sizecache        int32    `json:"-"`
@@ -203,6 +204,13 @@ func (m *Chunk) GetStateDeltaCommitment() []byte {
 	return nil
 }
 
+func (m *Chunk) GetServiceEventCount() uint32 {
+	if m != nil {
+		return m.ServiceEventCount
+	}
+	return 0
+}
+
 type ServiceEvent struct {
 	Type                 string   `protobuf:"bytes,1,opt,name=type,proto3" json:"type,omitempty"`
 	Payload              []byte   `protobuf:"bytes,2,opt,name=payload,proto3" json:"payload,omitempty"`
@@ -325,39 +333,41 @@ func init() {
 }
 
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