diff --git a/crates/rpc-types/src/genesis.rs b/crates/rpc-types/src/genesis.rs
index 7e1dd6a7b..cb2eb48f8 100644
--- a/crates/rpc-types/src/genesis.rs
+++ b/crates/rpc-types/src/genesis.rs
@@ -52,6 +52,8 @@ pub struct OpGenesisInfo {
     pub holocene_time: Option<u64>,
     /// isthmus hardfork timestamp
     pub isthmus_time: Option<u64>,
+    /// interop hardfork timestamp
+    pub interop_time: Option<u64>,
 }
 
 impl OpGenesisInfo {
@@ -130,6 +132,7 @@ mod tests {
                 granite_time: None,
                 holocene_time: None,
                 isthmus_time: None,
+                interop_time: None,
             }
         );
     }
@@ -189,6 +192,7 @@ mod tests {
                     granite_time: None,
                     holocene_time: None,
                     isthmus_time: None,
+                    interop_time: None,
                 }),
                 base_fee_info: Some(OpBaseFeeInfo {
                     eip1559_elasticity: None,
@@ -212,6 +216,7 @@ mod tests {
                     granite_time: None,
                     holocene_time: None,
                     isthmus_time: None,
+                    interop_time: None,
                 }),
                 base_fee_info: Some(OpBaseFeeInfo {
                     eip1559_elasticity: None,
@@ -251,6 +256,7 @@ mod tests {
                     granite_time: Some(0),
                     holocene_time: Some(0),
                     isthmus_time: None,
+                    interop_time: None,
                 }),
                 base_fee_info: None,
             }