diff --git a/firefox.spec b/firefox.spec
index ec7b31e..d7d9a09 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -157,9 +157,12 @@ ExcludeArch: aarch64
 %if !%{release_build}
 %global pre_tag .npgo
 %endif
+# Don't use 'clang' suffix on arm
+%ifnarch %{arm}
 %if %{build_with_clang}
 %global pre_tag .clang
 %endif
+%endif
 %if %{build_with_asan}
 %global pre_tag .asan
 %global build_with_pgo    0