THRIFT-4456: quiet haxelib the right way
diff --git a/build/docker/ubuntu-xenial/Dockerfile b/build/docker/ubuntu-xenial/Dockerfile
index acf3d12..d8b43f5 100644
--- a/build/docker/ubuntu-xenial/Dockerfile
+++ b/build/docker/ubuntu-xenial/Dockerfile
@@ -156,7 +156,7 @@
       neko-dev \
       libneko0 && \
     haxelib setup --always /usr/share/haxe/lib && \
-    haxelib install --quiet --always hxcpp 3.4.64
+    haxelib install --always hxcpp 3.4.64 2>&1 > /dev/null
 # note: hxcpp 3.4.185 (latest) no longer ships static libraries, and caused a build failure
 
 RUN apt-get install -y --no-install-recommends \