diff --git a/compiler/mono/src/ir.rs b/compiler/mono/src/ir.rs
index 436212ba2e..3c736435d9 100644
--- a/compiler/mono/src/ir.rs
+++ b/compiler/mono/src/ir.rs
@@ -2941,8 +2941,7 @@ fn specialize_naked_symbol<'a>(
     symbol: Symbol,
 ) -> Stmt<'a> {
     if procs.is_module_thunk(symbol) {
-        let partial_proc = procs.get_partial_proc(symbol).unwrap();
-        let fn_var = partial_proc.annotation;
+        let fn_var = variable;
 
         // This is a top-level declaration, which will code gen to a 0-arity thunk.
         let result = call_by_name(
diff --git a/compiler/test_gen/src/gen_tags.rs b/compiler/test_gen/src/gen_tags.rs
index b4abaf711f..89251ac981 100644
--- a/compiler/test_gen/src/gen_tags.rs
+++ b/compiler/test_gen/src/gen_tags.rs
@@ -1449,3 +1449,28 @@ fn issue_2365_monomorphize_tag_with_non_empty_ext_var_wrapped_nested() {
         u8
     )
 }
+
+#[test]
+#[cfg(any(feature = "gen-llvm", feature = "gen-wasm"))]
+fn issue_2445() {
+    assert_evals_to!(
+        indoc!(
+            r#"
+            app "test" provides [ main ] to "./platform"
+
+            none : [ None, Update a ]
+            none = None
+
+            press : [ None, Update U8 ]
+            press = none
+
+            main =
+                when press is
+                    None -> 15
+                    Update _ -> 25
+            "#
+        ),
+        15,
+        i64
+    );
+}