Remove trailing whitespace.
diff --git a/Doc/c-api/long.rst b/Doc/c-api/long.rst
index 57015db..4b21fd4 100644
--- a/Doc/c-api/long.rst
+++ b/Doc/c-api/long.rst
@@ -126,7 +126,7 @@
 
    Return a C :ctype:`long` representation of the contents of *pylong*.  If
    *pylong* is greater than :const:`LONG_MAX`, an :exc:`OverflowError` is raised
-   and ``-1`` will be returned. 
+   and ``-1`` will be returned.
 
 
 .. cfunction:: Py_ssize_t PyLong_AsSsize_t(PyObject *pylong)