diff --git a/0001-nss-use-nss-pkcs11-h.patch b/0001-nss-use-nss-pkcs11-h.patch
new file mode 100644
index 0000000..8ac86cc
--- /dev/null
+++ b/0001-nss-use-nss-pkcs11-h.patch
@@ -0,0 +1,58 @@
+From 083a3a62f2e631deec2fb2799d10660a41c50294 Mon Sep 17 00:00:00 2001
+From: Alon Bar-Lev <alon.barlev@gmail.com>
+Date: Fri, 30 Jul 2021 20:06:36 +0300
+Subject: [PATCH] nss: use nss pkcs11.h
+
+make nss happy with its own extensions and non-standard behavior.
+---
+ lib/_pkcs11h-crypto-nss.c | 14 ++++++++++----
+ lib/common.h              |  7 +++++++
+ 2 files changed, 17 insertions(+), 4 deletions(-)
+
+diff --git a/lib/_pkcs11h-crypto-nss.c b/lib/_pkcs11h-crypto-nss.c
+index 4b70e826..f57f9e6b 100644
+--- a/lib/_pkcs11h-crypto-nss.c
++++ b/lib/_pkcs11h-crypto-nss.c
+@@ -48,15 +48,21 @@
+  * POSSIBILITY OF SUCH DAMAGE.
+  */
+ 
+-#include "common.h"
+-
+-#include "_pkcs11h-crypto.h"
++#ifdef HAVE_CONFIG_H
++#include <config.h>
++#endif
+ 
+ #if defined(ENABLE_PKCS11H_ENGINE_NSS)
+-#define _PKCS11T_H_ /* required so no conflict with ours */
+ #include <nss.h>
+ #include <cert.h>
+ 
++/* Use PKCS#11 of nss to avoid conflicts and make nss happy with its own extensions */
++#define PKCS11_H 1
++
++#include "common.h"
++
++#include "_pkcs11h-crypto.h"
++
+ static
+ int
+ __pkcs11h_crypto_nss_initialize (
+diff --git a/lib/common.h b/lib/common.h
+index 61a958af..2499e9c5 100644
+--- a/lib/common.h
++++ b/lib/common.h
+@@ -72,5 +72,12 @@
+ 
+ #define _PKCS11H_ASSERT		assert
+ 
++#ifndef FALSE
++#define FALSE 0
++#endif
++#ifndef TRUE
++#define TRUE 1
++#endif
++
+ #endif
+ 
diff --git a/PKGBUILD b/PKGBUILD
index edb459f..a042058 100644
--- a/PKGBUILD
+++ b/PKGBUILD
@@ -5,18 +5,27 @@
 
 pkgname=pkcs11-helper
 pkgver=1.27.0
-pkgrel=1
+pkgrel=2
 pkgdesc="A library that simplifies the interaction with PKCS11 providers for end-user applications using a simple API and optional OpenSSL engine"
 arch=('x86_64')
 url='https://github.com/OpenSC/pkcs11-helper'
 license=(GPL BSD)
 depends=('gnutls' 'nss' 'openssl')
 provides=('libpkcs11-helper.so')
-source=("https://github.com/OpenSC/${pkgname}/releases/download/${pkgname}-${pkgver%.0}/${pkgname}-${pkgver}.tar.bz2")
-sha256sums=('653730f0c561bbf5941754c0783976113589b2dc64a0661c908dc878bfa4e58b')
+source=("https://github.com/OpenSC/${pkgname}/releases/download/${pkgname}-${pkgver%.0}/${pkgname}-${pkgver}.tar.bz2"
+        '0001-nss-use-nss-pkcs11-h.patch')
+sha256sums=('653730f0c561bbf5941754c0783976113589b2dc64a0661c908dc878bfa4e58b'
+            'a4a27c9f71c5f2cf57a79eeba2c6749424393c20e6b5967f46095b10f393f439')
+
+prepare() {
+  cd pkcs11-helper-$pkgver
+
+  patch -Np1 < ../0001-nss-use-nss-pkcs11-h.patch
+}
 
 build() {
   cd pkcs11-helper-$pkgver
+
   libtoolize
   aclocal
   autoheader
@@ -28,6 +37,7 @@ build() {
 
 package() {
   cd pkcs11-helper-$pkgver
+
   make DESTDIR="$pkgdir" install
   mkdir -p "$pkgdir"/usr/share/licenses/$pkgname/
   install -D -m0644 COPYING* "$pkgdir"/usr/share/licenses/$pkgname/