diff --git a/src/abi/full_program.rs b/src/abi/full_program.rs
index 9990480..8c7d778 100644
--- a/src/abi/full_program.rs
+++ b/src/abi/full_program.rs
@@ -221,7 +221,7 @@ impl FullTypeApplication {
 
 #[derive(Debug, Clone)]
 pub struct FullLoggedType {
-    pub log_id: u64,
+    pub log_id: String,
     pub application: FullTypeApplication,
 }
 
@@ -231,7 +231,7 @@ impl FullLoggedType {
         types: &HashMap<usize, TypeDeclaration>,
     ) -> FullLoggedType {
         FullLoggedType {
-            log_id: logged_type.log_id,
+            log_id: logged_type.log_id.clone(),
             application: FullTypeApplication::from_counterpart(&logged_type.application, types),
         }
     }
diff --git a/src/abi/program.rs b/src/abi/program.rs
index 716ff4f..5bc3b0e 100644
--- a/src/abi/program.rs
+++ b/src/abi/program.rs
@@ -86,7 +86,7 @@ pub struct TypeApplication {
 #[derive(Default, Debug, Clone, PartialEq, Eq, Serialize, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct LoggedType {
-    pub log_id: u64,
+    pub log_id: String,
     #[serde(rename = "loggedType")]
     pub application: TypeApplication,
 }