diff --git a/Cython/Compiler/Nodes.py b/Cython/Compiler/Nodes.py
index c740ba68861525c2fdd299dc29e07712e30de8b1..36d7e6ec1556b165e03934faef6bbcc229a2b80c 100644
--- a/Cython/Compiler/Nodes.py
+++ b/Cython/Compiler/Nodes.py
@@ -7789,6 +7789,7 @@ class CnameDecoratorNode(StatNode):
         if self.is_function:
             e.cname = self.cname
             e.func_cname = self.cname
+            e.used = True
         elif is_struct_or_enum:
             e.cname = e.type.cname = self.cname
         else: