diff --git a/clients/webassembly/src/client/config.rs b/clients/webassembly/src/client/config.rs
index ca92a7de87..3bde4d46e3 100644
--- a/clients/webassembly/src/client/config.rs
+++ b/clients/webassembly/src/client/config.rs
@@ -8,10 +8,11 @@
 
 use nym_client_core::config::{
     Acknowledgements as ConfigAcknowledgements, CoverTraffic as ConfigCoverTraffic,
-    DebugConfig as ConfigDebug, ExtendedPacketSize, GatewayConnection as ConfigGatewayConnection,
+    DebugConfig as ConfigDebug, GatewayConnection as ConfigGatewayConnection,
     GatewayEndpointConfig, ReplySurbs as ConfigReplySurbs, Topology as ConfigTopology,
     Traffic as ConfigTraffic,
 };
+use nym_sphinx::params::PacketSize;
 use serde::{Deserialize, Serialize};
 use std::time::Duration;
 use url::Url;
@@ -82,7 +83,7 @@ impl From<Traffic> for ConfigTraffic {
     fn from(traffic: Traffic) -> Self {
         let use_extended_packet_size = traffic
             .use_extended_packet_size
-            .then(|| ExtendedPacketSize::Extended32);
+            .then(|| PacketSize::ExtendedPacket32);
 
         ConfigTraffic {
             average_packet_delay: Duration::from_millis(traffic.average_packet_delay_ms),
@@ -91,7 +92,8 @@ impl From<Traffic> for ConfigTraffic {
             ),
             disable_main_poisson_packet_distribution: traffic
                 .disable_main_poisson_packet_distribution,
-            use_extended_packet_size,
+            primary_packet_size: PacketSize::RegularPacket,
+            secondary_packet_size: use_extended_packet_size,
         }
     }
 }
@@ -104,7 +106,7 @@ impl From<ConfigTraffic> for Traffic {
                 as u64,
             disable_main_poisson_packet_distribution: traffic
                 .disable_main_poisson_packet_distribution,
-            use_extended_packet_size: traffic.use_extended_packet_size.is_some(),
+            use_extended_packet_size: traffic.secondary_packet_size.is_some(),
         }
     }
 }
@@ -116,6 +118,10 @@ pub struct CoverTraffic {
     /// it is going to take for another loop cover traffic message to be sent.
     pub loop_cover_traffic_average_delay_ms: u64,
 
+    /// Specifies the ratio of `primary_packet_size` to `secondary_packet_size` used in cover traffic.
+    /// Only applicable if `secondary_packet_size` is enabled.
+    pub cover_traffic_primary_size_ratio: f64,
+
     /// Controls whether the dedicated loop cover traffic stream should be enabled.
     /// (and sending packets, on average, every [Self::loop_cover_traffic_average_delay])
     pub disable_loop_cover_traffic_stream: bool,
@@ -127,6 +133,7 @@ impl From<CoverTraffic> for ConfigCoverTraffic {
             loop_cover_traffic_average_delay: Duration::from_millis(
                 cover_traffic.loop_cover_traffic_average_delay_ms,
             ),
+            cover_traffic_primary_size_ratio: cover_traffic.cover_traffic_primary_size_ratio,
             disable_loop_cover_traffic_stream: cover_traffic.disable_loop_cover_traffic_stream,
         }
     }
@@ -138,6 +145,7 @@ impl From<ConfigCoverTraffic> for CoverTraffic {
             loop_cover_traffic_average_delay_ms: cover_traffic
                 .loop_cover_traffic_average_delay
                 .as_millis() as u64,
+            cover_traffic_primary_size_ratio: cover_traffic.cover_traffic_primary_size_ratio,
             disable_loop_cover_traffic_stream: cover_traffic.disable_loop_cover_traffic_stream,
         }
     }