diff --git a/benchmarks/asmjs-apps/harness.py b/benchmarks/asmjs-apps/harness.py
index 558d41c..c36111e 100755
--- a/benchmarks/asmjs-apps/harness.py
+++ b/benchmarks/asmjs-apps/harness.py
@@ -150,7 +150,7 @@ def BenchmarkJavaScript(options, args):
         for factor in range(0, 5):
             # Don't overwrite args!
             argv = [] + args
-            argv.extend(['-W', 'run.js', '--', benchmark.name + '.js', str(factor)])
+            argv.extend(['run.js', '--', benchmark.name + '.js', str(factor)])
             t = Exec(argv)
             t = t.strip()
             print(benchmark.name + '-workload' + str(factor) + ' - ' + t)
diff --git a/benchmarks/asmjs-ubench/harness.py b/benchmarks/asmjs-ubench/harness.py
index 976b6bd..bbabed8 100755
--- a/benchmarks/asmjs-ubench/harness.py
+++ b/benchmarks/asmjs-ubench/harness.py
@@ -59,7 +59,7 @@ def BenchmarkJavaScript(options, args):
     for benchmark in Benchmarks:
         # Don't overwrite args!
         argv = [] + args
-        argv.extend(['-W', 'ubench.js', '--', benchmark + '.js', RunFactor])
+        argv.extend(['ubench.js', '--', benchmark + '.js', RunFactor])
         t = Exec(argv)
         t = t.strip()
         print(benchmark + ' - ' + t)