diff --git a/firefox-nss-3.18.0.patch b/firefox-nss-3.18.0.patch
new file mode 100644
index 0000000..a693832
--- /dev/null
+++ b/firefox-nss-3.18.0.patch
@@ -0,0 +1,13 @@
+diff -up mozilla-release/configure.in.old mozilla-release/configure.in
+--- mozilla-release/configure.in.old	2015-04-28 20:31:45.000000000 +0200
++++ mozilla-release/configure.in	2015-04-28 20:32:40.807783614 +0200
+@@ -3627,7 +3627,7 @@ MOZ_ARG_WITH_BOOL(system-nss,
+     _USE_SYSTEM_NSS=1 )
+ 
+ if test -n "$_USE_SYSTEM_NSS"; then
+-    AM_PATH_NSS(3.18.1, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
++    AM_PATH_NSS(3.18.0, [MOZ_NATIVE_NSS=1], [AC_MSG_ERROR([you don't have NSS installed or your version is too old])])
+ fi
+ 
+ if test -n "$MOZ_NATIVE_NSS"; then
+diff -up mozilla-release/media/webrtc/trunk/Makefile.old mozilla-release/media/webrtc/trunk/Makefile
diff --git a/firefox.spec b/firefox.spec
index c3cd04d..624c1b0 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -143,6 +143,7 @@ Patch215:        firefox-enable-addons.patch
 Patch219:        rhbz-1173156.patch
 Patch220:        rhbz-1014858.patch
 Patch221:        firefox-fedora-ua.patch
+Patch222:        firefox-nss-3.18.0.patch
 
 # Upstream patches
 
@@ -295,6 +296,7 @@ cd %{tarballdir}
 %patch219 -p2 -b .rhbz-1173156
 %patch220 -p1 -b .rhbz-1014858
 %patch221 -p2 -b .fedora-ua
+%patch222 -p1 -b .nss-3.18.0
 
 # Upstream patches
 %if %{toolkit_gtk3}