diff --git a/raven/util.lua b/raven/util.lua
index e9326e7..4ada709 100644
--- a/raven/util.lua
+++ b/raven/util.lua
@@ -12,7 +12,9 @@ local string_find = string.find
 local string_sub = string.sub
 local string_match = string.match
 local math_random = math.random
+local math_randomseed = math.randomseed
 local os_date = os.date
+local os_time = os.time
 
 local _M = {}
 
@@ -28,6 +30,9 @@ function _M.errlog(...)
     print("[ERROR]", ...)
 end
 
+-- Seed the random number generator
+math_randomseed(os_time())
+
 --- Returns a string suitable to be used as `event_id`.
 -- @return a new random `event_id` string.
 function _M.generate_event_id()