diff --git a/src/mir/join_ir/lowering/mod.rs b/src/mir/join_ir/lowering/mod.rs
index 4e6d4fd5..8e915d03 100644
--- a/src/mir/join_ir/lowering/mod.rs
+++ b/src/mir/join_ir/lowering/mod.rs
@@ -51,7 +51,7 @@ use crate::mir::{BasicBlockId, MirFunction};
 /// Scope:
 /// - Only applies to whitelisted functions:
 ///   - IfSelectTest.* (Phase 33-2/33-3)
-///   - JsonShapeParser._read_value_from_pair/1 (Phase 33-4 Stage-1)
+///   - JsonShapeToMap._read_value_from_pair/1 (Phase 33-4 Stage-1)
 ///   - Stage1JsonScannerBox.value_start_after_key_pos/2 (Phase 33-4 Stage-B)
 /// - Requires NYASH_JOINIR_IF_SELECT=1 environment variable
 /// - Falls back to traditional if_phi on pattern mismatch
@@ -67,9 +67,10 @@ pub fn try_lower_if_to_joinir(
         return None;
     }
 
-    // Phase 33-4: 関数名ガード拡張（IfSelectTest + Stage-1/Stage-B 候補）
+    // Phase 33-4/33-5: 関数名ガード拡張（テスト + Stage-1/Stage-B 候補）
     let is_allowed = func.signature.name.starts_with("IfSelectTest.")
-        || func.signature.name == "JsonShapeParser._read_value_from_pair/1"
+        || func.signature.name.starts_with("Stage1JsonScannerTestBox.") // Phase 33-5 test
+        || func.signature.name == "JsonShapeToMap._read_value_from_pair/1"
         || func.signature.name == "Stage1JsonScannerBox.value_start_after_key_pos/2";
 
     if !is_allowed {