diff --git a/extra/thunderbird/PKGBUILD b/extra/thunderbird/PKGBUILD
index ca19986b2..f78850df3 100644
--- a/extra/thunderbird/PKGBUILD
+++ b/extra/thunderbird/PKGBUILD
@@ -9,13 +9,14 @@
 #  - patch to remove NEON/SIMD checks from configure
 #  - memory saving LDFLAGS
 #  - enable calendar in mozconfig
+#  - disable jemalloc on aarch64
 
 buildarch=28
 highmem=1
 
 pkgname=thunderbird
 pkgver=38.7.0
-pkgrel=1
+pkgrel=1.1
 pkgdesc="Standalone Mail/News reader"
 arch=('i686' 'x86_64')
 license=('MPL' 'GPL')
@@ -48,6 +49,8 @@ prepare() {
 
   cp "$srcdir/mozconfig" .mozconfig
 
+  [[ $CARCH == "aarch64" ]] && echo "ac_add_options --disable-jemalloc" >> .mozconfig
+
   # configure script misdetects the preprocessor without an optimization level
   # https://bugs.archlinux.org/task/34644
   sed -i '/ac_cpp=/s/$CPPFLAGS/& -O2/' mozilla/configure