diff --git a/coverage/parser.py b/coverage/parser.py
index f0d378c6b..70be0230d 100644
--- a/coverage/parser.py
+++ b/coverage/parser.py
@@ -611,6 +611,8 @@ def _line__Dict(self, node):
 
     _line__FunctionDef = _line_decorated
 
+    _line__AsyncFunctionDef = _line_decorated
+
     def _line__List(self, node):
         if node.elts:
             return self.line_for_node(node.elts[0])