diff --git a/pycparser-2.14-rstring_fix.patch b/pycparser-2.14-rstring_fix.patch
index 49eb8bf..92785e9 100644
--- a/pycparser-2.14-rstring_fix.patch
+++ b/pycparser-2.14-rstring_fix.patch
@@ -1,7 +1,20 @@
-diff -ru pycparser-release_v2.14/pycparser/c_lexer.py pycparser-release_v2.14_patched/pycparser/c_lexer.py
---- pycparser-release_v2.14/pycparser/c_lexer.py	2019-06-06 15:51:41.937286040 +0200
-+++ pycparser-release_v2.14_patched/pycparser/c_lexer.py	2019-06-06 15:53:15.269120067 +0200
-@@ -52,8 +52,8 @@
+From 2129f5fb1ec2d06000f10c96510874c5303d9f8c Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Ville=20Skytt=C3=A4?= <ville.skytta@iki.fi>
+Date: Sun, 5 Mar 2017 04:52:22 +0200
+Subject: [PATCH] Python 3.6 invalid escape sequence deprecation fixes (#177)
+
+https://docs.python.org/3/whatsnew/3.6.html#deprecated-python-behavior
+---
+ pycparser/c_lexer.py   | 4 ++--
+ tests/test_c_lexer.py  | 8 ++++----
+ tests/test_c_parser.py | 2 +-
+ 4 files changed, 8 insertions(+), 8 deletions(-)
+
+diff --git a/pycparser/c_lexer.py b/pycparser/c_lexer.py
+index 00dcd97..d9941c1 100644
+--- a/pycparser/c_lexer.py
++++ b/pycparser/c_lexer.py
+@@ -52,8 +52,8 @@ def __init__(self, error_func, on_lbrace_func, on_rbrace_func,
          # Allow either "# line" or "# <num>" to support GCC's
          # cpp output
          #
@@ -12,24 +25,11 @@ diff -ru pycparser-release_v2.14/pycparser/c_lexer.py pycparser-release_v2.14_pa
  
      def build(self, **kwargs):
          """ Builds the lexer from the specification. Must be
-diff -ru pycparser-release_v2.14/pycparser/c_lexer.py.ply pycparser-release_v2.14_patched/pycparser/c_lexer.py.ply
---- pycparser-release_v2.14/pycparser/c_lexer.py.ply	2015-06-10 05:00:55.000000000 +0200
-+++ pycparser-release_v2.14_patched/pycparser/c_lexer.py.ply	2019-06-06 15:53:44.972385501 +0200
-@@ -52,8 +52,8 @@
-         # Allow either "# line" or "# <num>" to support GCC's
-         # cpp output
-         #
--        self.line_pattern = re.compile('([ \t]*line\W)|([ \t]*\d+)')
--        self.pragma_pattern = re.compile('[ \t]*pragma\W')
-+        self.line_pattern = re.compile(r'([ \t]*line\W)|([ \t]*\d+)')
-+        self.pragma_pattern = re.compile(r'[ \t]*pragma\W')
- 
-     def build(self, **kwargs):
-         """ Builds the lexer from the specification. Must be
-diff -ru pycparser-release_v2.14/tests/test_c_lexer.py pycparser-release_v2.14_patched/tests/test_c_lexer.py
---- pycparser-release_v2.14/tests/test_c_lexer.py	2015-06-10 05:00:55.000000000 +0200
-+++ pycparser-release_v2.14_patched/tests/test_c_lexer.py	2019-06-10 14:57:24.981643354 +0200
-@@ -403,12 +403,12 @@
+diff --git a/tests/test_c_lexer.py b/tests/test_c_lexer.py
+index f965b24..11c7b26 100644
+--- a/tests/test_c_lexer.py
++++ b/tests/test_c_lexer.py
+@@ -430,12 +430,12 @@ def test_char_constants(self):
          self.assertLexerError("'b\n", ERR_UNMATCHED_QUOTE)
  
          self.assertLexerError("'jx'", ERR_INVALID_CCONST)
@@ -46,10 +46,11 @@ diff -ru pycparser-release_v2.14/tests/test_c_lexer.py pycparser-release_v2.14_p
  
      def test_preprocessor(self):
          self.assertLexerError('#line "ka"', ERR_FILENAME_BEFORE_LINE)
-diff -ru pycparser-release_v2.14/tests/test_c_parser.py pycparser-release_v2.14_patched/tests/test_c_parser.py
---- pycparser-release_v2.14/tests/test_c_parser.py	2015-06-10 05:00:55.000000000 +0200
-+++ pycparser-release_v2.14_patched/tests/test_c_parser.py	2019-06-10 14:58:40.725330566 +0200
-@@ -1637,7 +1637,7 @@
+diff --git a/tests/test_c_parser.py b/tests/test_c_parser.py
+index 95ae865..0835013 100755
+--- a/tests/test_c_parser.py
++++ b/tests/test_c_parser.py
+@@ -1718,7 +1718,7 @@ def test_whole_file_with_stdio(self):
  
          self.assertTrue(isinstance(p.ext[0], Typedef))
          self.assertEqual(p.ext[0].coord.line, 213)
diff --git a/python-pycparser.spec b/python-pycparser.spec
index 77bf7d8..4c74c99 100644
--- a/python-pycparser.spec
+++ b/python-pycparser.spec
@@ -15,6 +15,9 @@ URL:            http://github.com/eliben/pycparser
 Source0:        http://github.com/eliben/pycparser/archive/release_v%{version}.tar.gz
 Source1:        pycparser-0.91.1-remove-relative-sys-path.py
 
+# Python no longer accepts certain escape sequences, because they get treated as
+# unicode escape sequences.
+# https://github.com/eliben/pycparser/commit/2129f5fb1ec2d06000f10c96510874c5303d9f8c
 Patch0:         pycparser-2.14-rstring_fix.patch
 
 Patch100:       pycparser-2.10-ply.patch