diff --git a/mypy/checker.py b/mypy/checker.py
index 33ed5387554d..d9a1f3729c2f 100644
--- a/mypy/checker.py
+++ b/mypy/checker.py
@@ -5864,6 +5864,10 @@ def visit_decorator_inner(
                 object_type = self.lookup_type(d.expr)
                 fullname = self.expr_checker.method_fullname(object_type, d.name)
             self.check_for_untyped_decorator(e.func, dec, d)
+            if fullname:
+                dec = self.expr_checker.transform_callee_type(
+                    fullname, dec, [temp], [nodes.ARG_POS], e, object_type=object_type
+                )
             sig, t2 = self.expr_checker.check_call(
                 dec, [temp], [nodes.ARG_POS], e, callable_name=fullname, object_type=object_type
             )
diff --git a/test-data/unit/check-custom-plugin.test b/test-data/unit/check-custom-plugin.test
index dd1de1265b59..b79e752ed5ae 100644
--- a/test-data/unit/check-custom-plugin.test
+++ b/test-data/unit/check-custom-plugin.test
@@ -908,6 +908,19 @@ reveal_type(dynamic_signature(b))  # N: Revealed type is "builtins.bytes"
 \[mypy]
 plugins=<ROOT>/test-data/unit/plugins/function_sig_hook.py
 
+[case testFunctionSigHookCalledOnDecorator]
+# flags: --config-file tmp/mypy.ini
+
+def dynamic_signature(arg1: str) -> str: ...
+
+@dynamic_signature
+def f() -> None: ...
+
+reveal_type(f)  # N: Revealed type is "def ()"
+[file mypy.ini]
+\[mypy]
+plugins=<ROOT>/test-data/unit/plugins/function_sig_hook.py
+
 [case testPluginCalledCorrectlyWhenMethodInDecorator]
 # flags: --config-file tmp/mypy.ini
 from typing import TypeVar, Callable