diff --git a/firefox.spec b/firefox.spec
index 17b60e0..b329bd9 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -1,3 +1,6 @@
+# Build for arm architecture?
+%define disable_arm       1
+
 # Use system nspr/nss?
 %define system_nss        1
 
@@ -83,6 +86,10 @@
 %global tarballdir  mozilla-release
 %endif
 
+%if %{disable_arm}
+ExcludeArch: %{arm}
+%endif
+
 Summary:        Mozilla Firefox Web browser
 Name:           firefox
 Version:        28.0