diff --git a/Formula/trafficserver.rb b/Formula/trafficserver.rb
index 8998cc7dee..2fb43612eb 100644
--- a/Formula/trafficserver.rb
+++ b/Formula/trafficserver.rb
@@ -37,11 +37,6 @@ class Trafficserver < Formula
     # is not set then it's forced to 10.4, which breaks compile on Mojave.
     ENV["MACOSX_DEPLOYMENT_TARGET"] = MacOS.version
 
-    # Needed for OpenSSL headers
-    if MacOS.version <= :lion
-      ENV.append_to_cflags "-Wno-deprecated-declarations"
-    end
-
     args = %W[
       --prefix=#{prefix}
       --mandir=#{man}