diff --git a/backport-fix-64-to-32-bit-clang-conversion-warning.patch b/backport-fix-64-to-32-bit-clang-conversion-warning.patch
new file mode 100644
index 0000000000000000000000000000000000000000..9a585c9e0091ada46cc8445a6b78fcefed6ac529
--- /dev/null
+++ b/backport-fix-64-to-32-bit-clang-conversion-warning.patch
@@ -0,0 +1,53 @@
+From ba2e7c2f25047a6848f2baa9bc4cb700ea9dda84 Mon Sep 17 00:00:00 2001
+From: Hannah Shi <hannahshisfb@gmail.com>
+Date: Fri, 3 Jun 2022 17:16:29 -0700
+Subject: [PATCH] fix 64 to 32 bit clang conversion warning
+
+Change-Id: I62e86c0e19800e128c2d2fb5f952c9ee7a7b4258
+Reviewed-on: https://code-review.googlesource.com/c/re2/+/60210
+Reviewed-by: Perry Lorier <perryl@google.com>
+Reviewed-by: Paul Wankadia <junyer@google.com>
+---
+ util/rune.cc | 8 ++++----
+ 1 file changed, 4 insertions(+), 4 deletions(-)
+
+diff --git a/util/rune.cc b/util/rune.cc
+index 4f625ea3..a40e756c 100644
+--- a/util/rune.cc
++++ b/util/rune.cc
+@@ -51,7 +51,7 @@ int
+ chartorune(Rune *rune, const char *str)
+ {
+ 	int c, c1, c2, c3;
+-	long l;
++	Rune l;
+ 
+ 	/*
+ 	 * one character sequence
+@@ -127,7 +127,7 @@ int
+ runetochar(char *str, const Rune *rune)
+ {
+ 	/* Runes are signed, so convert to unsigned for range check. */
+-	unsigned long c;
++	unsigned int c;
+ 
+ 	/*
+ 	 * one character sequence
+@@ -212,7 +212,7 @@ int
+ utflen(const char *s)
+ {
+ 	int c;
+-	long n;
++	int n;
+ 	Rune rune;
+ 
+ 	n = 0;
+@@ -232,7 +232,7 @@ utflen(const char *s)
+ char*
+ utfrune(const char *s, Rune c)
+ {
+-	long c1;
++	int c1;
+ 	Rune r;
+ 	int n;
+ 
diff --git a/re2.spec b/re2.spec
index fe6a8ba127a58cee4f0d7334d81a7cffd211eb56..d7d2cb7da10533e7a8bd1f0c62ddc1d67e9df1d1 100644
--- a/re2.spec
+++ b/re2.spec
@@ -1,10 +1,11 @@
 Name:           re2
 Version:        20211101
-Release:        1
+Release:        2
 Summary:        Provide backtracking RE engine
 License:        BSD
 URL:            http://github.com/google/re2/
 Source0:        https://github.com/google/re2/archive/2021-11-01.tar.gz
+Patch0:         backport-fix-64-to-32-bit-clang-conversion-warning.patch
 BuildRequires:  gcc-c++
 
 %description
@@ -49,6 +50,9 @@ make %{?_smp_mflags} shared-test
 %exclude %{_libdir}/libre2.a
 
 %changelog
+* Mon Oct 24 2022 gaihuiying <eaglegai@163.com> - 20211101-2
+- fix 64 to 32 bit clang conversion warning
+
 * Sat Mar 19 2022 xihaochen <xihaochen@h-partners.com> - 20211101-1
 - upgrade to 20211101