diff --git a/lua/guid.lua b/lua/guid.lua
index 810cd82..1075da2 100644
--- a/lua/guid.lua
+++ b/lua/guid.lua
@@ -69,7 +69,7 @@ local function guid_generate()
 
     -- Set the two most significant bits (bits 6 and 7) of the
     -- clock_seq_hi_and_reserved to zero and one, respectively.
-    bytes[9] = bit.band(bit.bor(bytes[9], 0x80), 0x8f)
+    bytes[9] = bit.band(bit.bor(bytes[9], 0x80), 0xbf)
 
     -- Set the four most significant bits (bits 12 through 15) of the
     -- time_hi_and_version field to the 4-bit version number.
diff --git a/plugin/guid.lua b/plugin/guid.lua
index a31e99f..8337dba 100644
--- a/plugin/guid.lua
+++ b/plugin/guid.lua
@@ -18,6 +18,8 @@ if not vim.g.guid then
         guid.guid_object()
     end
 
+    math.randomseed(os.time())
+
     vim.api.nvim_create_user_command('GuidFormat', format, {nargs = '?'})
     vim.api.nvim_create_user_command('GuidInsert', insert, {nargs = '?'})
     vim.api.nvim_create_user_command('GuidObject', object, {})