diff --git a/src/_pytest/assertion/rewrite.py b/src/_pytest/assertion/rewrite.py
index ab8169da2..ff6333f24 100644
--- a/src/_pytest/assertion/rewrite.py
+++ b/src/_pytest/assertion/rewrite.py
@@ -680,7 +680,7 @@ class AssertionRewriter(ast.NodeVisitor):
             if (
                 expect_docstring
                 and isinstance(item, ast.Expr)
-                and isinstance(item.value, ast.Str)
+                and isinstance(item.value, ast.Constant)
             ):
                 doc = item.value.s
                 if self.is_rewrite_disabled(doc):