diff --git a/js/src/jit-test/jit_test.py b/js/src/jit-test/jit_test.py
index 72ea5fd6eb6..69f1c104c90 100755
--- a/js/src/jit-test/jit_test.py
+++ b/js/src/jit-test/jit_test.py
@@ -295,7 +295,7 @@ def parse_jitflags():
                  for flags in OPTIONS.jitflags.split(',') ]
     for flags in jitflags:
         for flag in flags:
-            if flag not in ('-j', '-m', '-p', '-d'):
+            if flag not in ('-j', '-m', '-a', '-p', '-d'):
                 print('Invalid jit flag: "%s"'%flag)
                 sys.exit(1)
     return jitflags