diff --git a/include/pocketpy/xmacros/smallmap.h b/include/pocketpy/xmacros/smallmap.h
index 51319138..5b24ba46 100644
--- a/include/pocketpy/xmacros/smallmap.h
+++ b/include/pocketpy/xmacros/smallmap.h
@@ -45,7 +45,7 @@ void SMALLMAP_METHOD(clear)(SMALLMAP* self);
 
 void SMALLMAP_METHOD(ctor)(SMALLMAP* self) {
     c11_vector__ctor(self, sizeof(KV));
-    c11_vector__reserve(self, 8);
+    c11_vector__reserve(self, 4);
 }
 
 void SMALLMAP_METHOD(dtor)(SMALLMAP* self) {