diff --git a/sdk/src/types/block/protocol/mod.rs b/sdk/src/types/block/protocol/mod.rs
index e4e2adaeb0..2c200bc596 100644
--- a/sdk/src/types/block/protocol/mod.rs
+++ b/sdk/src/types/block/protocol/mod.rs
@@ -91,6 +91,8 @@ pub struct ProtocolParameters {
     /// Defines the target size of the committee. If there's fewer candidates the actual committee size could be
     /// smaller in a given epoch.
     pub(crate) target_committee_size: u8,
+    /// Defines the number of heavier slots that a chain needs to be ahead of the current chain to be considered for switching.
+    pub(crate) chain_switching_threshold: u8,
 }
 
 // This implementation is required to make [`ProtocolParameters`] a [`Packable`] visitor.
@@ -128,6 +130,7 @@ impl Default for ProtocolParameters {
             version_signaling_parameters: Default::default(),
             rewards_parameters: Default::default(),
             target_committee_size: 32,
+            chain_switching_threshold: 3,
         }
     }
 }