diff --git a/patches/gecko-overlay/rfptargets/RFPTargetsDefault.inc b/patches/gecko-overlay/rfptargets/RFPTargetsDefault.inc
index 86f611c9..d85b57ea 100644
--- a/patches/gecko-overlay/rfptargets/RFPTargetsDefault.inc
+++ b/patches/gecko-overlay/rfptargets/RFPTargetsDefault.inc
@@ -25,6 +25,7 @@ ANDROID_DEFAULT(Gamepad)
 ANDROID_DEFAULT(HttpUserAgent)
 ANDROID_DEFAULT(JSDateTimeUTC)
 ANDROID_DEFAULT(JSLocale)
+ANDROID_DEFAULT(JSLocalePrompt)
 ANDROID_DEFAULT(JSMathFdlibm)
 ANDROID_DEFAULT(KeyboardEvents)
 ANDROID_DEFAULT(MediaCapabilities)