diff --git a/firefox.spec b/firefox.spec
index 3000bd1..d068381 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -630,7 +630,7 @@ MOZ_SMP_FLAGS=-j1
      RPM_BUILD_NCPUS="`/usr/bin/getconf _NPROCESSORS_ONLN`"
 [ "$RPM_BUILD_NCPUS" -ge 2 ] && MOZ_SMP_FLAGS=-j2
 %endif
-%ifarch x86_64 ppc ppc64 ppc64le %{arm}
+%ifarch x86_64 ppc ppc64 ppc64le %{arm} aarch64
 [ -z "$RPM_BUILD_NCPUS" ] && \
      RPM_BUILD_NCPUS="`/usr/bin/getconf _NPROCESSORS_ONLN`"
 [ "$RPM_BUILD_NCPUS" -ge 2 ] && MOZ_SMP_FLAGS=-j2