diff --git a/onnx/defs/__init__.py b/onnx/defs/__init__.py
index e367e49568a..f898e680682 100644
--- a/onnx/defs/__init__.py
+++ b/onnx/defs/__init__.py
@@ -9,6 +9,7 @@
     "AI_ONNX_PREVIEW_TRAINING_DOMAIN",
     "has",
     "register_schema",
+    "deregister_schema",
     "get_schema",
     "get_all_schemas",
     "get_all_schemas_with_history",