diff --git a/extra/firefox/PKGBUILD b/extra/firefox/PKGBUILD
index d06329fa0..5f7c96d9a 100644
--- a/extra/firefox/PKGBUILD
+++ b/extra/firefox/PKGBUILD
@@ -104,7 +104,7 @@ END
     echo "ac_add_options --disable-elf-hack" >> .mozconfig
     # https://bugzilla.redhat.com/show_bug.cgi?id=1641623
     echo "ac_add_options --disable-av1" >> .mozconfig
-    MAKEFLAGS="-j2"
+    MAKEFLAGS="-j1"
   elif [[ $CARCH == "aarch64" ]]; then
     echo 'ac_add_options --enable-rust-simd' >> .mozconfig
   fi