diff --git a/packages/bolt-connection/src/bolt/bolt-protocol-v1.js b/packages/bolt-connection/src/bolt/bolt-protocol-v1.js
index d04b33b4e..84c5deee7 100644
--- a/packages/bolt-connection/src/bolt/bolt-protocol-v1.js
+++ b/packages/bolt-connection/src/bolt/bolt-protocol-v1.js
@@ -499,6 +499,10 @@ export default class BoltProtocol {
    * @param {boolean} flush `true` if flush should happen after the message is written to the buffer.
    */
   write (message, observer, flush) {
+    this._lastMessageSignature = message.signature
+    const messageStruct = new structure.Structure(message.signature, message.fields)
+
+    this.packable(messageStruct)()
     const queued = this.queueObserverIfProtocolIsNotBroken(observer)
 
     if (queued) {
@@ -506,11 +510,6 @@ export default class BoltProtocol {
         this._log.debug(`C: ${message}`)
       }
 
-      this._lastMessageSignature = message.signature
-      const messageStruct = new structure.Structure(message.signature, message.fields)
-
-      this.packable(messageStruct)()
-
       this._chunker.messageBoundary()
       if (flush) {
         this._chunker.flush()
diff --git a/packages/neo4j-driver-deno/lib/bolt-connection/bolt/bolt-protocol-v1.js b/packages/neo4j-driver-deno/lib/bolt-connection/bolt/bolt-protocol-v1.js
index a83f32f5a..cec3d5d06 100644
--- a/packages/neo4j-driver-deno/lib/bolt-connection/bolt/bolt-protocol-v1.js
+++ b/packages/neo4j-driver-deno/lib/bolt-connection/bolt/bolt-protocol-v1.js
@@ -499,6 +499,10 @@ export default class BoltProtocol {
    * @param {boolean} flush `true` if flush should happen after the message is written to the buffer.
    */
   write (message, observer, flush) {
+    this._lastMessageSignature = message.signature
+    const messageStruct = new structure.Structure(message.signature, message.fields)
+
+    this.packable(messageStruct)()
     const queued = this.queueObserverIfProtocolIsNotBroken(observer)
 
     if (queued) {
@@ -506,11 +510,6 @@ export default class BoltProtocol {
         this._log.debug(`C: ${message}`)
       }
 
-      this._lastMessageSignature = message.signature
-      const messageStruct = new structure.Structure(message.signature, message.fields)
-
-      this.packable(messageStruct)()
-
       this._chunker.messageBoundary()
       if (flush) {
         this._chunker.flush()