diff --git a/src/ArduinoJson/Memory/ResourceManager.hpp b/src/ArduinoJson/Memory/ResourceManager.hpp
index 4d044b9e..d566e3fa 100644
--- a/src/ArduinoJson/Memory/ResourceManager.hpp
+++ b/src/ArduinoJson/Memory/ResourceManager.hpp
@@ -45,6 +45,7 @@ class ResourceManager {
 #if ARDUINOJSON_USE_8_BYTE_POOL
     swap(a.eightBytePools_, b.eightBytePools_);
 #endif
+    swap_(a.allocator_, b.allocator_);
     swap_(a.overflowed_, b.overflowed_);
   }