diff --git a/crates/compiler/specialize_types/src/foreign_symbol.rs b/crates/compiler/specialize_types/src/foreign_symbol.rs
index b7f3dcc7e5..c668bc5ba5 100644
--- a/crates/compiler/specialize_types/src/foreign_symbol.rs
+++ b/crates/compiler/specialize_types/src/foreign_symbol.rs
@@ -1,5 +1,5 @@
 use roc_module::ident::ForeignSymbol;
-use soa::Id;
+use soa::Index;
 
 #[derive(Debug, Default)]
 pub struct ForeignSymbols {
@@ -26,12 +26,12 @@ impl ForeignSymbols {
         self.inner.push(entry);
 
         ForeignSymbolId {
-            inner: Id::new(id as u32),
+            inner: Index::new(id as u32),
         }
     }
 }
 
 #[derive(Debug, Copy, Clone, PartialEq, Eq)]
 pub struct ForeignSymbolId {
-    inner: Id<ForeignSymbol>,
+    inner: Index<ForeignSymbol>,
 }
diff --git a/crates/compiler/specialize_types/src/mono_ir.rs b/crates/compiler/specialize_types/src/mono_ir.rs
index 854e8b4883..249da15a2f 100644
--- a/crates/compiler/specialize_types/src/mono_ir.rs
+++ b/crates/compiler/specialize_types/src/mono_ir.rs
@@ -6,7 +6,7 @@ use roc_can::expr::Recursive;
 use roc_module::low_level::LowLevel;
 use roc_module::symbol::Symbol;
 use roc_region::all::Region;
-use soa::{Id, Index, NonEmptySlice, Slice, Slice2, Slice3};
+use soa::{Index, NonEmptySlice, Slice, Slice2, Slice3};
 use std::iter;
 
 #[derive(Clone, Copy, Debug, PartialEq)]
@@ -46,7 +46,7 @@ impl MonoExprs {
         self.regions.push(region);
 
         MonoExprId {
-            inner: Id::new(index),
+            inner: Index::new(index),
         }
     }
 
@@ -146,22 +146,22 @@ impl MonoExprs {
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct MonoExprId {
-    inner: Id<MonoExpr>,
+    inner: Index<MonoExpr>,
 }
 
 impl MonoExprId {
-    pub(crate) unsafe fn new_unchecked(inner: Id<MonoExpr>) -> Self {
+    pub(crate) unsafe fn new_unchecked(inner: Index<MonoExpr>) -> Self {
         Self { inner }
     }
 }
 
 #[derive(Clone, Copy, Debug, PartialEq, Eq)]
 pub struct MonoStmtId {
-    inner: Id<MonoStmt>,
+    inner: Index<MonoStmt>,
 }
 
 impl MonoStmtId {
-    pub(crate) unsafe fn new_unchecked(inner: Id<MonoStmt>) -> Self {
+    pub(crate) unsafe fn new_unchecked(inner: Index<MonoStmt>) -> Self {
         Self { inner }
     }
 }
diff --git a/crates/soa/src/soa_index.rs b/crates/soa/src/soa_index.rs
index c01d2b6e3d..9d955ace0f 100644
--- a/crates/soa/src/soa_index.rs
+++ b/crates/soa/src/soa_index.rs
@@ -8,8 +8,6 @@ use core::{
 
 use crate::soa_slice::Slice;
 
-pub type Id<T> = Index<T>;
-
 /// An index into an array of values, based
 /// on an offset into the array rather than a pointer.
 ///