diff --git a/bin/check-http.rb b/bin/check-http.rb
index 2d931ba..cda472b 100755
--- a/bin/check-http.rb
+++ b/bin/check-http.rb
@@ -59,6 +59,7 @@
 require 'net/http'
 require 'net/https'
 require 'digest'
+require 'resolv-replace'
 
 #
 # Check HTTP
@@ -262,6 +263,11 @@ def run
       config[:port] ||= config[:ssl] ? 443 : 80
     end
 
+    # Use Ruby DNS Resolver and set DNS resolution timeout to 800ms
+    dns_resolver = Resolv::DNS.new
+    dns_resolver.timeouts = 0.8
+    Resolv::DefaultResolver.replace_resolvers([dns_resolver])
+
     begin
       Timeout.timeout(config[:timeout]) do
         acquire_resource