diff --git a/core/smallobject_hotbox_v4.c b/core/smallobject_hotbox_v4.c
index 6f3ddd21..a2cf1c30 100644
--- a/core/smallobject_hotbox_v4.c
+++ b/core/smallobject_hotbox_v4.c
@@ -17,7 +17,7 @@
 // TLS context
 static __thread small_heap_ctx_v4 g_ctx_v4;
 
-#define V4_MAX_PARTIAL_PAGES 2
+#define V4_MAX_PARTIAL_PAGES 1
 
 small_heap_ctx_v4* small_heap_ctx_v4_get(void) {
     return &g_ctx_v4;
@@ -175,8 +175,12 @@ static small_page_v4* small_alloc_slow_v4(small_heap_ctx_v4* ctx, int class_idx)
         return cur;  // usable current
     }
     if (cur && !cur->freelist) {
-        // current を full list に残しておき、free で戻す
-        v4_page_push_full(h, cur);
+        // current をいったん partial/full に退避（partial を優先）
+        if (h->partial_count < V4_MAX_PARTIAL_PAGES) {
+            v4_page_push_partial(h, cur);
+        } else {
+            v4_page_push_full(h, cur);
+        }
         h->current = NULL;
     }