diff --git a/readbc.lua b/readbc.lua
index dc775b0..c305113 100644
--- a/readbc.lua
+++ b/readbc.lua
@@ -53,6 +53,7 @@ local function read_uleb128(fp)
     while not last_byte do
         local uleb_byte = read_u8(fp)
         res = bit.bor(res, bit.lshift(bit.band(uleb_byte, 0x7f), shift))
+        shift = shift + 7
 
         if bit.band(uleb_byte, 0x80) == 0 then
             last_byte = true