diff --git a/js/src/devtools/automation/warnaserr b/js/src/devtools/automation/warnaserr
index be143cead03..a74c31b332f 100644
--- a/js/src/devtools/automation/warnaserr
+++ b/js/src/devtools/automation/warnaserr
@@ -1,4 +1,4 @@
 --enable-threadsafe
 --enable-optimize
---enable-sm-fail-on-warnings
+--enable-warnings-as-errors
 
diff --git a/js/src/devtools/automation/warnaserrdebug b/js/src/devtools/automation/warnaserrdebug
index b62c7d46f15..b9149b8074d 100644
--- a/js/src/devtools/automation/warnaserrdebug
+++ b/js/src/devtools/automation/warnaserrdebug
@@ -1,3 +1,3 @@
 --enable-threadsafe
 --enable-debug
---enable-sm-fail-on-warnings
+--enable-warnings-as-errors