diff --git a/backport-0001-w32-Use-cast-by-uintptr_t-for-thread-ID.patch b/backport-0001-w32-Use-cast-by-uintptr_t-for-thread-ID.patch
new file mode 100755
index 0000000..e02e454
--- /dev/null
+++ b/backport-0001-w32-Use-cast-by-uintptr_t-for-thread-ID.patch
@@ -0,0 +1,73 @@
+From 377c1b91e67af25613ccb72ee26449661cea8d8e Mon Sep 17 00:00:00 2001
+From: NIIBE Yutaka <gniibe@fsij.org>
+Date: Thu, 8 Nov 2018 13:26:41 +0900
+Subject: [PATCH 12/18] w32: Use cast by uintptr_t for thread ID.
+
+* w32/npth.c (npth_init): Cast with uintptr_t.
+(npth_setname_np, npth_create, npth_self): Likewise.
+
+--
+
+In w32/npth.h, npth_t is unsigned long int type, which is 32-bit
+for both of 32-bit machine and 64-bit machine.
+
+We use TlsSetValue, TlsGetValue and CreateThread API to handle
+thread ID, which uses void * type, which is 64-bit on 64-bit
+machine.
+
+Because the size is different on 64-bit machine, here, we use explicit
+cast to integer type which has enough size to have pointer.
+
+Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>
+---
+ w32/npth.c | 10 +++++-----
+ 1 file changed, 5 insertions(+), 5 deletions(-)
+
+diff --git a/w32/npth.c b/w32/npth.c
+index 6ea6d19..41213c0 100644
+--- a/w32/npth.c
++++ b/w32/npth.c
+@@ -351,7 +351,7 @@ npth_init (void)
+   thread = thread_table[thread_id];
+   thread->handle = handle;
+ 
+-  if (! TlsSetValue(tls_index, (LPVOID) thread_id))
++  if (! TlsSetValue(tls_index, (LPVOID)(uintptr_t) thread_id))
+     return map_error (GetLastError());
+ 
+   LEAVE();
+@@ -449,11 +449,11 @@ npth_setname_np (npth_t target_thread, const char *name)
+ static DWORD
+ thread_start (void *arg)
+ {
+-  npth_t thread_id = (npth_t) arg;
++  npth_t thread_id = (npth_t)(uintptr_t) arg;
+   npth_impl_t thread;
+   void *result;
+ 
+-  if (! TlsSetValue(tls_index, (LPVOID) thread_id))
++  if (! TlsSetValue(tls_index, (LPVOID)(uintptr_t) thread_id))
+     /* FIXME: There is not much we can do here.  */
+     ;
+ 
+@@ -519,7 +519,7 @@ npth_create (npth_t *newthread, const npth_attr_t *user_attr,
+ 
+   handle = CreateThread (NULL, 0,
+ 			 (LPTHREAD_START_ROUTINE)thread_start,
+-			 (void *) thread_id, CREATE_SUSPENDED,
++			 (void *)(uintptr_t) thread_id, CREATE_SUSPENDED,
+ 			 NULL);
+   if (handle == NULL)
+     {
+@@ -556,7 +556,7 @@ npth_self (void)
+   if (thread_id == 0 && GetLastError() != ERROR_SUCCESS)
+     /* FIXME: Log the error.  */
+     ;
+-  return (npth_t) thread_id;
++  return (npth_t)(uintptr_t) thread_id;
+ }
+ 
+ 
+-- 
+1.8.3.1
+
diff --git a/npth.spec b/npth.spec
index f2a23ce..705a7a1 100644
--- a/npth.spec
+++ b/npth.spec
@@ -1,6 +1,6 @@
 Name:           npth
 Version:        1.6
-Release:        1
+Release:        2
 Summary:        The New GNU Portable Threads library
 License:        LGPLv2+
 URL:            http://git.gnupg.org/cgi-bin/gitweb.cgi?p=npth.git
@@ -19,6 +19,8 @@ stack, signal mask and errno variable.
 
 %package        devel
 Summary:        Development files for %{name}
+Patch6000: backport-0001-w32-Use-cast-by-uintptr_t-for-thread-ID.patch
+
 Requires:       %{name}%{?_isa} = %{version}-%{release}
 
 %description    devel
@@ -55,7 +57,11 @@ make check
 %{_datadir}/aclocal/%{name}.m4
 
 %changelog
+* Mon Sep 28 2020 EulerOSWander <314264452@qq.com> - 1.6-2
+- Use cast by uintptr_t for thread ID.
+
 * Thu Jul 23 2020 jinzhimin <jinzhimin2@huawei.com> - 1.6-1
 - Package update
+
 * Tue Aug 13 2019 openEuler Buildteam <buildteam@openeuler.org> - 1.5-7
 - Package init