diff --git a/changes/2743-uriyyo.md b/changes/2743-uriyyo.md
new file mode 100644
index 0000000..29d58aa
--- /dev/null
+++ b/changes/2743-uriyyo.md
@@ -0,0 +1 @@
+Fix mypy plugin issue with self field declaration.
\ No newline at end of file
diff --git a/pydantic/mypy.py b/pydantic/mypy.py
index 0598ef5..8107b54 100644
--- a/pydantic/mypy.py
+++ b/pydantic/mypy.py
@@ -619,7 +619,7 @@ def add_method(
     #     first = []
     else:
         self_type = self_type or fill_typevars(info)
-        first = [Argument(Var('self'), self_type, None, ARG_POS)]
+        first = [Argument(Var('__pydantic_self__'), self_type, None, ARG_POS)]
     args = first + args
     arg_types, arg_names, arg_kinds = [], [], []
     for arg in args:
diff --git a/tests/mypy/modules/plugin_success.py b/tests/mypy/modules/plugin_success.py
index d24f8cb..1f334ee 100644
--- a/tests/mypy/modules/plugin_success.py
+++ b/tests/mypy/modules/plugin_success.py
@@ -158,3 +158,7 @@ class NotFrozenModel(FrozenModel):
 
 NotFrozenModel(x=1).x = 2
 NotFrozenModel.from_orm(model)
+
+
+class ModelWithSelfField(BaseModel):
+    self: str