diff --git a/netlify.toml b/netlify.toml
index ef95c9b70aa..fe0a115fc30 100644
--- a/netlify.toml
+++ b/netlify.toml
@@ -20,7 +20,7 @@ command = "CI='' yarn run build"
 [build.environment]
 NODE_VERSION = "16"
 YARN_VERSION = "3.2.1"
-YARN_FLAGS = "-mode=update-lockfile"
+YARN_FLAGS = "--mode=update-lockfile"
 YARN_CACHE_FOLDER = "/opt/buildhome/.yarn_cache"
 
 [[plugins]]