diff --git a/modules/libpref/init/all.js b/modules/libpref/init/all.js
index aed22011f9..d1bfaa8bce 100644
--- a/modules/libpref/init/all.js
+++ b/modules/libpref/init/all.js
@@ -1299,6 +1299,7 @@ pref("javascript.options.discardSystemSource", false);
 // Comment 32 and Bug 613551.
 pref("javascript.options.mem.high_water_mark", 128);
 pref("javascript.options.mem.max", -1);
+pref("javascript.options.mem.nursery.max_kb", -1);
 pref("javascript.options.mem.gc_per_zone", true);
 pref("javascript.options.mem.gc_incremental", true);
 pref("javascript.options.mem.gc_incremental_slice_ms", 15);