diff --git a/libsrtp-2.3.0-nss-3.63-fix.patch b/libsrtp-2.3.0-nss-3.63-fix.patch
new file mode 100644
index 0000000..b4713e2
--- /dev/null
+++ b/libsrtp-2.3.0-nss-3.63-fix.patch
@@ -0,0 +1,24 @@
+diff -up libsrtp-2.3.0/crypto/include/aes_gcm.h.nssfix libsrtp-2.3.0/crypto/include/aes_gcm.h
+--- libsrtp-2.3.0/crypto/include/aes_gcm.h.nssfix	2021-04-15 13:47:08.667150587 -0400
++++ libsrtp-2.3.0/crypto/include/aes_gcm.h	2021-04-15 13:47:26.991294515 -0400
+@@ -66,6 +66,8 @@ typedef struct {
+ 
+ #ifdef NSS
+ 
++#define NSS_PKCS11_2_0_COMPAT 1
++
+ #include <nss.h>
+ #include <pk11pub.h>
+ 
+diff -up libsrtp-2.3.0/crypto/include/aes_icm_ext.h.nssfix libsrtp-2.3.0/crypto/include/aes_icm_ext.h
+--- libsrtp-2.3.0/crypto/include/aes_icm_ext.h.nssfix	2021-04-15 13:47:36.617370124 -0400
++++ libsrtp-2.3.0/crypto/include/aes_icm_ext.h	2021-04-15 13:59:50.074073286 -0400
+@@ -65,6 +65,8 @@ typedef struct {
+ 
+ #ifdef NSS
+ 
++#define NSS_PKCS11_2_0_COMPAT 1
++
+ #include <nss.h>
+ #include <pk11pub.h>
+ 
diff --git a/libsrtp.spec b/libsrtp.spec
index aceff3d..4068402 100644
--- a/libsrtp.spec
+++ b/libsrtp.spec
@@ -2,7 +2,7 @@
 
 Name:		libsrtp
 Version:	2.3.0
-Release:	5%{?dist}
+Release:	6%{?dist}
 Summary:	An implementation of the Secure Real-time Transport Protocol (SRTP)
 License:	BSD
 URL:		https://github.com/cisco/libsrtp
@@ -15,6 +15,9 @@ Patch0:		libsrtp-2.3.0-shared-fix.patch
 Patch1:		libsrtp-2.3.0-test-util.patch
 # Link test binaries against shared lib
 Patch2:		libsrtp-2.3.0-shared-test-fix.patch
+# Fix issue with NSS 3.63 incompatibility
+# credit to George Joseph
+Patch3:		libsrtp-2.3.0-nss-3.63-fix.patch
 
 %description
 This package provides an implementation of the Secure Real-time
@@ -42,6 +45,7 @@ Tools for testing and decoding SRTP
 %patch0 -p1 -b .sharedfix
 %patch1 -p1 -b .utilfix
 %patch2 -p1 -b .test-shared-fix
+%patch3 -p1 -b .nssfix
 
 %if 0%{?rhel} > 0
 %ifarch ppc64
@@ -84,6 +88,9 @@ install -D -p -m 0755 test/test_srtp %{buildroot}%{_bindir}/test_srtp
 %{_bindir}/*
 
 %changelog
+* Thu Apr 15 2021 Tom Callaway <spot@fedoraproject.org> - 2.3.0-6
+- fix NSS incompatibility, thanks to George Joseph
+
 * Tue Jan 26 2021 Fedora Release Engineering <releng@fedoraproject.org> - 2.3.0-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_34_Mass_Rebuild