diff --git a/firefox.spec b/firefox.spec
index c9443bc..92df61a 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -8,6 +8,8 @@
 ExcludeArch: ppc64le
 # Disabled due to https://pagure.io/fedora-infrastructure/issue/7581
 ExcludeArch: s390x
+# Temporary disabled, filed as rhbz#1872111
+ExcludeArch: aarch64
 
 %global enable_mozilla_crashreporter 0
 %ifarch x86_64 %{ix86}
@@ -621,6 +623,8 @@ MOZ_SMP_FLAGS=-j1
 [ "$RPM_BUILD_NCPUS" -ge 2 ] && MOZ_SMP_FLAGS=-j2
 [ "$RPM_BUILD_NCPUS" -ge 4 ] && MOZ_SMP_FLAGS=-j4
 [ "$RPM_BUILD_NCPUS" -ge 8 ] && MOZ_SMP_FLAGS=-j8
+#[ "$RPM_BUILD_NCPUS" -ge 16 ] && MOZ_SMP_FLAGS=-j16
+#[ "$RPM_BUILD_NCPUS" -ge 24 ] && MOZ_SMP_FLAGS=-j24
 %endif
 
 echo "mk_add_options MOZ_MAKE_FLAGS=\"$MOZ_SMP_FLAGS\"" >> .mozconfig