diff --git a/src/black/handle_ipynb_magics.py b/src/black/handle_ipynb_magics.py
index 5b2847cb0c4..1695c568bd5 100644
--- a/src/black/handle_ipynb_magics.py
+++ b/src/black/handle_ipynb_magics.py
@@ -294,8 +294,8 @@ def _is_ipython_magic(node: ast.expr) -> TypeGuard[ast.Attribute]:
 def _get_str_args(args: List[ast.expr]) -> List[str]:
     str_args = []
     for arg in args:
-        assert isinstance(arg, ast.Str)
-        str_args.append(arg.s)
+        assert isinstance(arg, ast.Constant) and isinstance(arg.value, str)
+        str_args.append(arg.value)
     return str_args