diff --git a/firefox.spec b/firefox.spec
index 7effe6f..f738118 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -136,10 +136,14 @@ License:        MPLv1.1 or GPLv2+ or LGPLv2+
 ExcludeArch:    %{ix86}
 %endif
 %if 0%{?rhel} == 8
+  %if %{rhel_minor_version} == 1
+ExcludeArch:    %{ix86} aarch64 s390x
+  %else
 ExcludeArch:    %{ix86}
+  %endif
 %endif
 %if 0%{?rhel} == 7
-ExcludeArch:    s390 ppc
+ExcludeArch:    aarch64 s390 ppc
 %endif
 
 # We can't use the official tarball as it contains some test files that use