diff --git a/benchmark/benchmark.js b/benchmark/benchmark.js
index 3bf13c2093..8b29c28a26 100644
--- a/benchmark/benchmark.js
+++ b/benchmark/benchmark.js
@@ -364,7 +364,7 @@ function sampleModule(modulePath) {
     const child = cp.spawn(
       process.argv[0],
       [
-        '--noconcurrent_sweeping',
+        '--no-concurrent-sweeping',
         '--predictable',
         '--expose-gc',
         '--eval',
diff --git a/cspell.yml b/cspell.yml
index 857f928f10..d263f8c44d 100644
--- a/cspell.yml
+++ b/cspell.yml
@@ -27,7 +27,6 @@ words:
   - transpilation
   - instanceof
   - flowtype
-  - noconcurrent
 
   # Different names used inside tests
   - Skywalker