diff --git a/rhbz-1014858.patch b/rhbz-1014858.patch
new file mode 100644
index 0000000..c953b33
--- /dev/null
+++ b/rhbz-1014858.patch
@@ -0,0 +1,16 @@
+diff -up mozilla-release/toolkit/xre/nsAppRunner.cpp.old mozilla-release/toolkit/xre/nsAppRunner.cpp
+--- mozilla-release/toolkit/xre/nsAppRunner.cpp.old	2014-11-26 03:17:40.000000000 +0100
++++ mozilla-release/toolkit/xre/nsAppRunner.cpp	2015-01-05 14:23:05.977933308 +0100
+@@ -4168,10 +4168,8 @@ XREMain::XRE_main(int argc, char* argv[]
+ 
+ #if defined(MOZ_WIDGET_GTK)
+ #if defined(MOZ_MEMORY) || defined(__FreeBSD__) || defined(__NetBSD__)
+-  // Disable the slice allocator, since jemalloc already uses similar layout
+-  // algorithms, and using a sub-allocator tends to increase fragmentation.
+-  // This must be done before g_thread_init() is called.
+-  g_slice_set_config(G_SLICE_CONFIG_ALWAYS_MALLOC, 1);
++  // rhbz#1014858 - enable slice allocator for child processes
++  unsetenv("G_SLICE");
+ #endif
+   g_thread_init(nullptr);
+ #endif
diff --git a/thunderbird.sh.in b/thunderbird.sh.in
index badc70e..f1b0746 100644
--- a/thunderbird.sh.in
+++ b/thunderbird.sh.in
@@ -54,6 +54,11 @@ export MOZ_APP_LAUNCHER="/usr/bin/thunderbird"
 GNOME_DISABLE_CRASH_DIALOG=1
 export GNOME_DISABLE_CRASH_DIALOG
 
+##
+## Disable the SLICE allocator (rhbz#1014858)
+##
+export G_SLICE=always-malloc
+
 ##
 ## To disable the use of Firefox localization, set MOZ_DISABLE_LANGPACKS=1
 ## in your environment before launching Firefox.
diff --git a/thunderbird.spec b/thunderbird.spec
index 7991533..bbd56b8 100644
--- a/thunderbird.spec
+++ b/thunderbird.spec
@@ -58,7 +58,7 @@
 Summary:        Mozilla Thunderbird mail/newsgroup client
 Name:           thunderbird
 Version:        31.4.0
-Release:        1%{?dist}
+Release:        2%{?dist}
 URL:            http://www.mozilla.org/projects/thunderbird/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Group:          Applications/Internet
@@ -89,6 +89,7 @@ Patch300:       xulrunner-24.0-jemalloc-ppc.patch
 # Fedora specific patches
 Patch400:       rhbz-966424.patch
 Patch401:       mozilla-858919.patch
+Patch402:       rhbz-1014858.patch
 
 # Epel patches:
 Patch500:       firefox-system-nss-3.16.2.patch
@@ -179,6 +180,7 @@ cd mozilla
 %patch300 -p2 -b .852698
 %patch400 -p1 -b .966424
 %patch401 -p1 -b .858919
+%patch402 -p1 -b .rhbz-1014858
 
 %if 0%{?rhel} > 6
 %patch500 -p2 -b .nss-ver
@@ -460,6 +462,10 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #===============================================================================
 
 %changelog
+* Fri Feb 20 2015 Martin Stransky <stransky@redhat.com> - 31.4.0-2
+- Fixed rhbz#1187746 - GLib allocation error
+  when starting thunderbird
+
 * Wed Jan 14 2015 Jan Horak <jhorak@redhat.com> - 31.4.0-1
 - Update to 31.4.0