diff --git a/CHANGELOG.next.asciidoc b/CHANGELOG.next.asciidoc
index 685ddb2d060..c7428267700 100644
--- a/CHANGELOG.next.asciidoc
+++ b/CHANGELOG.next.asciidoc
@@ -88,6 +88,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 
 *Packetbeat*
 
+- Fix default cache size calculation. {pull}36723[36723]
 
 *Winlogbeat*
 
diff --git a/packetbeat/protos/amqp/amqp_structs.go b/packetbeat/protos/amqp/amqp_structs.go
index 7abba4fc914..de31fce6af3 100644
--- a/packetbeat/protos/amqp/amqp_structs.go
+++ b/packetbeat/protos/amqp/amqp_structs.go
@@ -27,7 +27,7 @@ import (
 type amqpMethod func(*amqpMessage, []byte) (bool, bool)
 
 const (
-	transactionsHashSize = 2 ^ 16
+	transactionsHashSize = 1 << 16
 	transactionTimeout   = 10 * 1e9
 )
 
diff --git a/packetbeat/protos/protos.go b/packetbeat/protos/protos.go
index 23c79750370..3841db8f91b 100644
--- a/packetbeat/protos/protos.go
+++ b/packetbeat/protos/protos.go
@@ -33,7 +33,7 @@ import (
 )
 
 const (
-	DefaultTransactionHashSize                 = 2 ^ 16
+	DefaultTransactionHashSize                 = 1 << 16
 	DefaultTransactionExpiration time.Duration = 10 * time.Second
 )