diff --git a/compiler/Lowerer.ts b/compiler/Lowerer.ts
index 4d1aafb..2239a17 100644
--- a/compiler/Lowerer.ts
+++ b/compiler/Lowerer.ts
@@ -23,6 +23,7 @@ class LocalsFnRoot implements Locals {
     allocSym(ident: string) {
         this.symLocalMap[ident] = this.localIdCounter;
         this.localIdCounter++;
+        this.reserveId(this.localIdCounter);
     }
 
     symId(ident: string): number {
@@ -50,6 +51,7 @@ class LocalLeaf implements Locals {
     allocSym(ident: string) {
         this.symLocalMap[ident] = this.localIdCounter;
         this.localIdCounter++;
+        this.reserveId(this.localIdCounter);
     }
 
     symId(ident: string): number {
@@ -176,4 +178,3 @@ export class Lowerer {
         );
     }
 }
-