diff --git a/src/cli/onezone b/src/cli/onezone
index acf713042e1..dc84c2a2ff3 100755
--- a/src/cli/onezone
+++ b/src/cli/onezone
@@ -114,7 +114,7 @@ CommandParser::CmdParser.new(ARGV) do
             exit(-1)
         end
 
-        if !%r/^(http|https):\/\//.match(options[:server_rpc])
+        if !%r{^(http|https):\/\/}.match(options[:server_rpc])
             puts 'Wrong protocol specified. Only http or https allowed!'
             exit(-1)
         end