--- a/browser/config/mozconfigs/linux64/nightly-asan
+++ b/browser/config/mozconfigs/linux64/nightly-asan
@@ -1,12 +1,16 @@
 # We still need to build with debug symbols
 ac_add_options --disable-debug
 ac_add_options --enable-optimize="-O2 -gline-tables-only"
 
+# TODO remove once configure defaults to stylo once stylo enabled
+# on all platforms.
+ac_add_options --enable-stylo=build
+
 # ASan specific options on Linux
 ac_add_options --enable-valgrind
 
 . $topsrcdir/build/unix/mozconfig.asan
 
 export PKG_CONFIG_LIBDIR=/usr/lib64/pkgconfig:/usr/share/pkgconfig
 . $topsrcdir/build/unix/mozconfig.gtk
 

--- a/browser/config/mozconfigs/linux64/nightly-fuzzing-asan
+++ b/browser/config/mozconfigs/linux64/nightly-fuzzing-asan
@@ -1,12 +1,16 @@
 # We still need to build with debug symbols
 ac_add_options --disable-debug
 ac_add_options --enable-optimize="-O2 -gline-tables-only"
 
+# TODO remove once configure defaults to stylo once stylo enabled
+# on all platforms.
+ac_add_options --enable-stylo=build
+
 # ASan specific options on Linux
 ac_add_options --enable-valgrind
 
 . $topsrcdir/build/unix/mozconfig.fuzzing
 
 ac_add_options --enable-fuzzing
 ac_add_options --disable-stdcxx-compat