diff --git a/js/src/shell/fuzz-flags.txt b/js/src/shell/fuzz-flags.txt
index c7b0911c2111..b4a60d5bbbf3 100644
--- a/js/src/shell/fuzz-flags.txt
+++ b/js/src/shell/fuzz-flags.txt
@@ -33,6 +33,8 @@
 --ion-scalar-replacement=on
 --ion-sincos=off
 --ion-sincos=on
+--ion-warmup-threshold=0
+--ion-warmup-threshold=10
 --ion-warmup-threshold=100
 --no-native-regexp
 --nursery-strings=off