diff --git a/libs/core/langchain_core/load/load.py b/libs/core/langchain_core/load/load.py
index f5a179d00c5..4f8612b1ceb 100644
--- a/libs/core/langchain_core/load/load.py
+++ b/libs/core/langchain_core/load/load.py
@@ -156,6 +156,9 @@ class Reviver:
 
             cls = getattr(mod, name)
 
+            # Import MessageV1Types lazily to avoid circular import:
+            # load.load -> v1.messages -> messages.ai -> messages.base ->
+            #   load.serializable -> load.__init__ -> load.load
             from langchain_core.v1.messages import MessageV1Types
 
             # The class must be a subclass of Serializable or a v1 message class.