--- a/dom/ipc/ContentPrefs.cpp
+++ b/dom/ipc/ContentPrefs.cpp
@@ -63,16 +63,19 @@ const char* mozilla::dom::ContentPrefs::
   "font.size.inflation.forceEnabled",
   "font.size.inflation.lineThreshold",
   "font.size.inflation.mappingIntercept",
   "font.size.inflation.maxRatio",
   "font.size.inflation.minTwips",
   "full-screen-api.allow-trusted-requests-only",
   "full-screen-api.enabled",
   "full-screen-api.unprefix.enabled",
+#ifdef FUZZING
+  "fuzzing.enabled",
+#endif
   "gfx.font_rendering.opentype_svg.enabled",
   "hangmonitor.timeout",
   "html5.flushtimer.initialdelay",
   "html5.flushtimer.subsequentdelay",
   "html5.offmainthread",
   "intl.charset.fallback.tld",
   "intl.ime.hack.on_ime_unaware_apps.fire_key_events_for_composition",
   "javascript.enabled",