diff --git a/components/chainhook-sdk/src/chainhooks/types.rs b/components/chainhook-sdk/src/chainhooks/types.rs
index ad9cc22da..19dfcc1ee 100644
--- a/components/chainhook-sdk/src/chainhooks/types.rs
+++ b/components/chainhook-sdk/src/chainhooks/types.rs
@@ -770,7 +770,9 @@ pub enum StacksContractDeploymentPredicate {
 #[derive(Clone, Debug, Serialize, Deserialize, PartialEq, JsonSchema)]
 #[serde(rename_all = "snake_case")]
 pub struct StacksPrintEventBasedPredicate {
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub contract_identifier: Option<String>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub contains: Option<String>,
 }