How to use LUA to parse a Property file

How to use LUA to parse a Property file

I need help on a small LUA script that needs to parse a property file and
generate an array using string key. Here's what I tried to do;
file = assert(io.open("/root/test.prop", "r"))
property = {}
for line in file:lines() do
for key, value in string.gmatch(line, "(.-)=(%w+)") do property[key] =
value end
end
For some unknown reason only the first pair of key value is added to the
table. Since I,m new to LUA, can somebody give an hint.