diff --git a/firefox.spec b/firefox.spec
index 5eddde9..1cb000f 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -1,3 +1,6 @@
+# Disabled arm due to rhbz#1658940
+ExcludeArch: armv7hl
+
 %global system_nss        1
 %global system_ffi        1
 %global system_libvpx     1
@@ -77,7 +80,7 @@ Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        64.0
 
-Release:        5%{?pre_tag}%{?dist}
+Release:        4%{?pre_tag}%{?dist}
 URL:            https://www.mozilla.org/firefox/
 License:        MPLv1.1 or GPLv2+ or LGPLv2+
 Source0:        https://archive.mozilla.org/pub/firefox/releases/%{version}%{?pre_version}/source/firefox-%{version}%{?pre_version}.source.tar.xz
@@ -887,9 +890,6 @@ gtk-update-icon-cache %{_datadir}/icons/hicolor &>/dev/null || :
 #---------------------------------------------------------------------
 
 %changelog
-* Thu Dec 13 2018 Martin Stransky <stransky@redhat.com> - 64.0-5
-- Enable arm.
-
 * Wed Dec 12 2018 Martin Stransky <stransky@redhat.com> - 64.0-4
 - Use gcc on all platforms for official release.