diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index 521b8b9b1d4..508ffc3b4a2 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -21,9 +21,9 @@ they actually work.  Since some code samples behave differently under Linux,
 Windows, or Mac OS X, they contain doctest directives in comments.
 
 Note: Some code samples reference the ctypes :class:`c_int` type.  On platforms
-where ``sizeof(long double) == sizeof(double)`` it is an alias to
-:class:`c_double`.  So, you should not be confused if :class:`c_long` is
-printed if you would expect :class:`c_int` --- they are actually the same type.
+where ``sizeof(long) == sizeof(int)`` it is an alias to :class:`c_long`.
+So, you should not be confused if :class:`c_long` is printed if you would expect
+:class:`c_int` --- they are actually the same type.
 
 .. _ctypes-loading-dynamic-link-libraries: