diff --git a/crates/ibc/src/mock/context.rs b/crates/ibc/src/mock/context.rs
index e306fa9d5d..fe3a33aa23 100644
--- a/crates/ibc/src/mock/context.rs
+++ b/crates/ibc/src/mock/context.rs
@@ -323,7 +323,7 @@ impl From<MockContextConfig> for MockContext {
         MockContext {
             host_chain_type: params.host_type,
             host_chain_id: params.host_id.clone(),
-            max_history_size: params.max_history_size,
+            max_history_size: params.max_history_size as u64,
             history: (0..n)
                 .rev()
                 .map(|i| {