diff --git a/src/module/functions/local_function/mod.rs b/src/module/functions/local_function/mod.rs
index f4abbe0a..66fceac8 100644
--- a/src/module/functions/local_function/mod.rs
+++ b/src/module/functions/local_function/mod.rs
@@ -10,7 +10,6 @@ use crate::ir::*;
 use crate::map::{IdHashMap, IdHashSet};
 use crate::parse::IndicesToIds;
 use crate::{Data, DataId, FunctionBuilder, FunctionId, MemoryId, Module, Result, TypeId, ValType};
-use id_arena::Id;
 use std::collections::BTreeMap;
 use wasmparser::{FuncValidator, Operator, ValidatorResources};
 
@@ -106,12 +105,12 @@ impl LocalFunction {
     }
 
     /// Iterate over all the blocks in the function
-    pub fn blocks(&self) -> impl Iterator<Item = (Id<InstrSeq>, &InstrSeq)> {
+    pub fn blocks(&self) -> impl Iterator<Item = (InstrSeq, &InstrSeq)> {
         self.builder.arena.iter()
     }
 
     /// Mutably iterate over all the blocks in the function
-    pub fn blocks_mut(&mut self) -> impl Iterator<Item = (Id<InstrSeq>, &mut InstrSeq)> {
+    pub fn blocks_mut(&mut self) -> impl Iterator<Item = (InstrSeqId, &mut InstrSeq)> {
         self.builder.arena.iter_mut()
     }