diff --git a/firefox.spec b/firefox.spec
index f604edd..7e2bc01 100644
--- a/firefox.spec
+++ b/firefox.spec
@@ -497,9 +497,9 @@ echo "ac_add_options --disable-jemalloc" >> .mozconfig
 
 # We don't have recent nasm on Fedora 30...time to update to Fedora 31.
 %if 0%{?fedora} < 31
-ac_add_options --disable-av1
+echo "ac_add_options --disable-av1" >> .mozconfig
 %else
-ac_add_options --enable-av1
+echo "ac_add_options --enable-av1" >> .mozconfig
 %endif
 
 # api keys full path