diff --git a/packages/compiler/src/ir/numeric-call-specialization.ts b/packages/compiler/src/ir/numeric-call-specialization.ts
index b126fe1dd..ecb7e9447 100644
--- a/packages/compiler/src/ir/numeric-call-specialization.ts
+++ b/packages/compiler/src/ir/numeric-call-specialization.ts
@@ -169,9 +169,9 @@ export function specializeNumericCalls(
         ...implementation,
         name,
         params: fn.params.map((param) =>
-          ids.has(param.localId) ? { ...param, type: F64 } : param,
+          ids.has(param.localId) ? { ...param!, type: F64 } : param,
         ),
-        locals: fn.locals.map((local) => (ids.has(local.id) ? { ...local, type: F64 } : local)),
+        locals: fn.locals.map((local) => (ids.has(local.id) ? { ...local!, type: F64 } : local)),
         body: specializeBody(fn, slots),
       };
       variants.set(fn.name, variant);
diff --git a/tests/harness/self-hosting-llvm-emitter.test.ts b/tests/harness/self-hosting-llvm-emitter.test.ts
index c5ab38bbd..a37e9254a 100644
--- a/tests/harness/self-hosting-llvm-emitter.test.ts
+++ b/tests/harness/self-hosting-llvm-emitter.test.ts
@@ -112,6 +112,10 @@ const programs = [
   "local-union-storage.ts",
   "class-callback-storage.ts",
   "byte-record-windows.ts",
+  "constant-callback-dispatch.ts",
+  "constant-number-remainders.ts",
+  "numeric-call-specialization.ts",
+  "scalar-string-slices.ts",
 ];
 
 for (const backend of ["llvm"] as const) {